Fair enough. But I just don't think he got that angry unless it was really justified. I mean, we'd see him get that kind of mad at the likes of Nazi criminals. Or a man beating his wife. I mean, to me those are things I want Superman to get pretty heated over.
But I agree with you on the rest, I never thought Superman was just for kids before the reboot. The "boy scout" persona was and is a thing, and not something I'm that big a fan of, but I never equated that as being too kiddy. Neither his innate goodness. Something I don't think any version of the character ever took away though. I always defend the character when people will say he's not interesting because he's "too good".