both Garou and Siryuu are on the path to understanding what a hero really is, Garou didn't give into his anger and kill the worker for going from "i'll treat you to meal" to "your criminal scum, DIE" despite the fact it was Siryuu who ruined the worker's truck without a second thought, hell Garou got pissed when Siryuu did, and once Siryuu was at his mercy, he just left without even a single revenge punch. Restraint is one of the many steps...
but i dunno if Siryuu will become a actual hero, his entire point in this arc might be to really show the flaws of the Neo heroes.