This is the first chapter of Esper Mami that doesn't count with good ending. I mean, what good ending?
Letting the old man kill that guy? In formal justice, that guy has gotten into jail, but is it justice for the old man?
While rereading it, at first glance it seems that guy is looking for excuse, especially with the "youngins" thing, but they have a wee bit of point. Is being a biker gang the only way for them to channel their excessive energy? Or the system is being picky with the young ones? This chapter sure doesn't show them in a good light though, not especially when the guy admits he has disliking to the police.