I suppose the wackadoodle crackpots who engage in mass murder believe they are "at war" with the enemy. Hate is the motive. Or is it?

If you are such a nutjob that you plan to murder..either singular targets or mobs...your brain is defective  and not working logically. Unless of course you think it is perfectly logical to murder strangers to sate hate. I don't. You don't like someone? Avoid him/her. But the wackadoodle nutjobs want to exterminate them. How is that sane?