People who take pleasure in killing insects and spiders.
Try catch and release or shoo them out, and if that fails and you need to resort to lethal means don't act like you've killed a lion in unarmed combat.
It really depends on what it is.
Spiders and bees will be dealt with humanely and removed safely where possible
Flies get one chance with an open window, but if they **** it up they are getting swatted.
Wasps deserve to die horrible, horrible deaths. I will make it my mission to kill as many as possible.