I'm fine with all games, really, as long as they've got the appropriate rating - which really should be a max of 15. When you think about it, from movies and highschool life, what hasn't a 15-year-old been exposed to?
They're bashing the move to the DS here since it's more "child friendly", but again, the correct rating and restrictions at sale should be enough to filter out "those who shouldn't play".
As for parents who buy such games for their kids, irresponsible or not, that's the parent's call, and not much can be done about it, other than more explicitly warning parents of the content.
The only type of games I do have some form of objection to are rape simulators. I can't come up with a decent argument as to why hentai is okay, but yeah....the idea just seems a bit too hard-core.