Peril and by the nature of peril violence is part of "all ages" entertainment for all time.
Well that's a question of degree isn't it? There's a world of difference between the kind of violence in, say,
The Judge Child and the kind we see in
Killing Time or
Cinnabar. If you are serious about your point that any level of unlimited violence and brutality is suitable for young children as long as there is no sex, then you might be in a minority opinion among parents there.
I didn't get your point about CBBC I'm afraid (it sounds like the exact opposite of what 2000AD is doing, more like if an adult channel did one day a month of children's programmes).
I'm quite happy for Regened to happen four times a year, but if I wanted to read all ages stuff all the time then I'd be buying the Phoenix instead of 2000AD.