Dude its because they are in the apocalyptic world. Everyone in the world is depending on them. If they have one off day. BOOM there goes the human race in third impact. Because we all know that what happened with Rei in End of Eva was just onbe of the possibilities set forth. WE dont know what would have happened if the angels had reached adam OR Lilith. Let alone what would have happened if we fused with them. (humans are the last angel.)ANYWAYS. I think that they have the right to their extremely bad pyshy problems.