This furry zoosadist thing is new to me, and while I know as a fact that it is not limited only to the furry community, something that I am somewhat knowledgeable in is the gay community because I am gay (maybe powerlevel? but it's not important) and it is something I have learned, both through experience and my experience as a teenager and by watching the shitfest of the "LGBT" community and the various studies that have been conducted on it.
Gay people are vulnerable, homosexuals as children are vulnerable, impressionable people. The occurrence of developmental and psychiatric disorders among homosexuals is disproportionate in comparison to the heterosexual population. For example, some of the common symptoms is a complete lack of self control, attention seeking behaviour and hypersexuality. These behaviours increase ones vulnerability to people that take advantage (though I do not absolve myself or other homosexuals of the responsibility they have over themselves, this is a parenting issue and the homosexual community is very opposed to parental guidance, and in some cases interference)--through the total exclusion from outside influences (parents, the wider society) using the guise of intolerance further proliferated and blown beyond its bounds by the LGBT and homosexual community, and the resulting engagement in the "accepting group" and the behaviours adopted by it are more often damaging for the individuals that engage in them, because there is no "positive outcome" (except maybe HIV) from desensitisation to and outright enjoyment of immoral behaviours, and a lack of control in ones life.
The gay community tells homosexuals that the world is dangerous--that homosexuals have no control, and the only place that they have acceptance is within their community. But the community is not well policed, it's a hotbed for degeneracy and impulsive; uncontrolled, negative behaviours.
You can see the parallels within the furry community, and possibly why the two groups intertwine, and why the occurrence of these disgusting behaviours is more common among gays.