I think a great deal of this has to do with the fact that many people perceive furry itself to be taboo, including much of the porn industry. Since we’re already considered taboo, there’s no longer an obligation to uphold cultural norms and we’re kind of free to explore whatever we want. Additionally, since there is no major medium dictating the tone of the genre, it leaves the field completely open for expression. This became all the more apparent when furry began to embrace the themes of hyper and herms early on and persisted in further forms like diaperfurs and paw-fetishists.

In a way, being around all kinds of extreme perspectives in the furry community set the tone for a fandom that’s much more tolerant of different themes and ways of thinking. You didn’t have to like it yourself but it’s hard not to see it around. And who knows, you may personally see something you like that you never expected you’d like and begin to relate to those with what some would consider ‘outsider’ opinions.

Perhaps the reason this ideology is so prevalent in furs and less so among traditional porn artists is because of just that: they’re traditional. Your 'normal’ porn artists are in an industry that’s older than anyone working in it today and because of that, it’s mired in tradition. Outsider ideas and opinions will be subject to a long-standing set of cultural norms and social contracts. Homophobia is still alive and well in the straight porn industry. Some of these guys could not even begin to understand pansexual and trans without frothing at the mouth. On the other hand, the furry community is quite young and has the benefit of being filled with a mostly-younger crowd which is statistically more progressive than their predecessors.