Why do so many who support gay marriage just go with their "feelings" instead of facts?

Lots of idiot gay supporters. It is NOT natural. No laws of nature can justify two men/woman mating. Look at every other animal even wolves/ Elephant/ mammals..... They gay are treated mental and are usually kicked out our killed. It is part of human nature to dislike gays just like cannibalism. Don't bring the overpopulation point. Want to stop Overpopulation, murder ( which I do not condone). Many gays claim that it comes from birth. Instead of spending tax-payer money on the messed up pride parade, fund the cure of the horrid disease ity.