Talk:Twilight's Kingdom - Part 2/@comment-26973802-20140521025558/@comment-4531340-20140525224106

Probably because those are both very non human-esque characters (what I mean is that they show very few, if any, traits that would be associated with humans, such as being able to talk, for one, and to think rationally), and in the past, it seems that the more non-human a character is, the more violence it's okay to show against them. Since Tirek talks, I guess it wouldn't be as okay. As far as the dragon, Rainbow Dash doesn't really leave any damage, and it's pretty cartoony, so that's probably how they got away with that (and anyways, BS&P people are very finicky, and so will very often change what they okay and what they don't from episode to episode, season to season).