The 44-year-old suffered non-life-threatening injuries that affect him to this day. As he recovered in hospital, he was visited by the great and the good of Australian society. The country's prime minister, Anthony Albanese, praised him as "the best of our country".

"He was trying to get a cup of coffee and found himself at a moment where people were being shot in front of him," Albanese told the assembled press after the bedside visit.

"He decided to take action and his bravery is an inspiration for all Australians. He is a very humble man."

When he was eventually released from hospital, the father of two girls was given a standing ovation on the final day of the Ashes series at the Sydney Cricket Ground. As he walked out under the 148-year-old regal Members’ Pavilion, he carried his injured arm in a sling and bowed his head. 

White Australia rose to its feet and hailed this immigrant son of Syria as one of its own, albeit from a safe distance. As a token of their appreciation, his compatriots (and grateful people the world over) pitched in and raised $2.6m on a GoFundMe page. This will go a long way to securing his future. 

This should have been the end of it for Al Ahmed. He should have been looking forward to a lifetime of warm handshakes, backslaps and quiet recognition. Instead, his problems were only beginning.

Earlier this month, New South Wales police confirmed Al Ahmed had been charged with domestic violence and common assault as well as attempts to “stalk or intimidate”. The charges came off the back of an alleged incident that took place on March 9 at a house in Bankstown, a culturally diverse neighbourhood 30 minutes south-west of Sydney’s central business district by car.

According to reports, the incident involved a violent dispute with his father, during which Al Ahmed somehow got him in a headlock.

It later emerged charges had been brought against two of Al Ahmed’s younger brothers, Hozifa Al Ahmed and Sameh Al Ahmed, for using a carriage service to menace and harass. Though the two were freed on conditional bail, the brothers were issued with restraining orders to protect Al Ahmed after they allegedly threatened him over the phone if he didn’t give them $100,000 each.

Al Ahmed has maintained his innocence throughout the ordeal and it is hard not to see this sorry saga as a case of sudden wealth coming between families and leading to a feud.

In a dramatic and sometimes heart-wrenching interview two days after the charges were served against him, Al Ahmed told CB2 Radio’s Ben Fordham Live that his brothers had flown in from Germany and Russia. He had sponsored their three-month visitor visas so they could be with their brother in his hour of need. It appears when they discovered he now had money, they began to harass him. As for the charges against him?

“This situation is untrue and it’s extortion,” he told Fordham. “I’m an honourable guy. I’ve never been a violent guy. I’ve never hurt anyone. The Bondi situation showed that. When I disarmed the terrorist, I took his gun and I throw it away. But I didn’t hurt him.” 

In the interview, Al Ahmed claimed his father had contacted him to drop the charges against his brothers, and when he refused, his father reported what Al Ahmed claims are made-up allegations against him.

“Guess what?” Fordham said in response to the story. “I don’t believe them. I don’t believe your brothers. I don’t believe your dad. I don’t believe any of them and I can’t believe the police took this seriously but then again, maybe the police have just got to do their job.” 

While this is not yet a tale of a fallen hero, Al Ahmed is falling. When he appears in court to face these charges at the end of the month, we will have a better idea of the outcome and his future. 

But already parts of the media are licking their lips. Many were no doubt delighted to see that one of the charges against him involved the words "domestic violence", and added them, and everything they inferred, to their headlines to spice things up.

On that fateful morning in December, Al Ahmed acted on impulse. He was living in the moment, focused on the present and on an honourable duty to help fellow humans. When he acted, he was not a Muslim stopping another Muslim from killing Jews. He was a man who stopped another man from committing an act of pure evil. At that moment, Al Ahmed had no past and no future. 

But when you thrust yourself into the limelight, the self no longer belongs to you. As a hero, you belong to everyone. The hero’s past and his or her future are now the property of the ‘public interest,’ and if that public interest exposes flaws, then all the better for the narrative. 

The men and women who stood in admiration at the Sydney Cricket Ground are the very same who will now read about these charges and pass judgement on them, whether they are true or not.

Al Ahmed was badly injured on that day in December. He was shot five times in his shoulder and it will take several operations before he can even dream of returning to his former strength. These injuries might well help prove his innocence, but in the meantime, the speculation about this reluctant hero’s family life will play out in a pantomime he never asked for.

In the same week Al Ahmed was forced to plead his innocence, news emerged the man he disarmed is facing fresh charges on top of the 59 he already faces. These include 10 counts of "shooting with intent to murder".

That the hero and the villain are now both facing the courts is a reminder to would-be heroes everywhere that the long-term circumstances can often be worse than the short term sacrifices they make to do the right thing.

• Tune into News From Around the World with Jonathan deBurca Butler every Tuesday on Newstalk’s Moncrieff Show