I think that's their way of saying "handle with care" rather than saying they're too violent. I've seen a bunch of them, and believe me when I say Adventure Time is far more offensive than anything these have to offer (or even the '90s Superman cartoon). I don't think there's any physical contact aside from grabs in them...

also, sadly, Batman TAS basically wouldn't be for children anymore. Certainly not Saturday mornings... it fit the evening slot on Cartoon Network better anyway if you ask me though.