Furries are into sexy animals because they don't have the social skills to make it with normal humans. Again, fuck em.
I thought that too... but some people that I know who label themselves as 'furry' seem to be no worse off than anyone else socially... some even apparently have relationshiops outside their furry fetish.
I guess that's the question... why is this fetish 'worse' than the others?
Its not. Its just they get very defensive about it, so it is fun to poke them with sticks.
Ah, well that makes sense 
Average troll: "ha ha, furries are perverted animals fuckers."
Average furry: "Zomg I AM NOT stop fursecuting me! You are worse than a thousand Hitlers, you and your bigotry. I had you just like I hate my parents and one day you will ALL PAY! *swishes 17 fox tails, leaves thread*
Of course, you have to up the ante somewhat now, but the same basic logic applies.