Uh... Definitely in disagreement here. I've only been in two instances where the kick was unfair:
1. I was in a 24 man raid and one alliance kicked a member for simply him not knowing the fight. When asked if they explained to them what they did wrong, we got a "no, not my job to".
2. Got kicked out of POTD (of all things) for popping one of our Rage poms on floor 98 and going to every room with my friend to grab chests because we had no angel ones.

Otherwise it was justified or they afked.