Going to interrupt the Itadori yeeted Amos Yee memes for a bit:
It was said before upthread, but he was arrested for draft dodging and his mum paid bail. His only crime in Singaporean soil is that. The noncery was sadly on the land of the free and the home of the brave. All countries with military conscription will force you to pay a fine if you refuse to comply. If Hasan returned to Turkey he would get the same treatment and the same outcome.
Singapore has strict laws against violence. To the point "assault" is the mere implication you may attack someone or a threat you may do it and "criminal force" is you actually doing it. Defending yourself is allowed as long as you do proportionally. Up to 3 months imprisonment and $1500 fine. If Itadori can prove that Amos provoked him, he still could get up to a month imprisonment and $1000 fine.
The penal status in case you want to read it.