If you really want to boil it down, we're all full of crap. Why is it bad to kill a bat, but OK to kill a mosquito? It's because we are viewing things from a human perspective - bats are good and cute but mosquitoes serve no purpose that we find useful. I'm sure mosquitoes find their own survival useful.

If we're really going to defend bats, we should also start a campaign against OFF, Raid, and anyone with a flyswatter.