The very first thing that came to mind is the emphasis on fursonas and how much author/artist stand-in characters there are. Why do we as a fandom even have fursonas as a main thing? And furthermore, why the incredible overabundance of porn? I believe that the answer to these questions is that although the Furry community is indeed about enjoying anthropomorphic art/stories/movies/RP/etc., another huge part of this fandom, in fact I daresay, maybe an even bigger part of it, is general escapism.
Now it's very true that you could say that about many fandoms. But the thing about those fandoms is, they're focused on one consistent particular universe. They wish to live in that SPECIFIC kind of world. And the desire to live in that world usually have specific reasons. For example. Someone may be in the Star Wars fandom because they would love to be able to be a Jedi/Sith.
The furry fandom has no such specificity at all. Settings range anywhere from tribal to sci-fi to modern day. As such, the fandom emphasizes escapism and embraces it completely and totally in all its forms, the fans immersing themselves in their own personal paradises. This also explains the massive amounts of porn. After all, we're all human, and there are few betters ways to escape and experience bliss than sex. So, it's natural that porn is hands down the most common way the fandom emphasizes and practices escapism.
This also explains why the furry fandom can be so attractive to newcomers. The focus on escapism allows them to embrace their deep desires. A lot may not even understand why they feel attracted to this fandom, but they'll still feel it, and sometimes they're affected so strongly, it makes them obsessed with such.
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The second part of this furry sandwich here is another huge part of the fandom. And that is the general friendliness, inclusivity, and unity of the fandom as a whole. Now, the why of this actually is a bit unknown to me here, although I have a small theory. Now, it's obvious that when one is generally in a good mood, they're less irritable. More understanding. More loving. Etc. And since everyone as mentioned above is participating in their own escapism and desires, sometimes on a very deep level, this makes them generally more happy and serene of course. More able to accept the differences of others. And since the fandom can be a potent little drug, it brings out these traits in people much more than other fandoms.
I also believe that the happiness of this fandom is very infectious. If you're around happy blissful people all the time, at least some of it's gonna rub off on you. That or you'll be weirded out and leave for another place. But there you have it. Either way, what's left is just happy, inclusive, serene people. This unity, along with escapism, also heavily contributes as to why this fandom can be so attractive and so addictive in a way.
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How this all arose in the first place though (the escapism and the unity) from an anthro appreciation... I don't really know. I believe it's the fact that since the Furry fandom doesn't focus at all on any one particular work like Star Wars or Lord of the Rings, it had an incredibly open "canon". Hence, people filled in the blanks for themselves. And they filled it with what they desired it should be. And as everyone started doing this, they began to, unintentionally or no, immerse themselves in their own individual fantasies and began to talk, socialize, and accept each other more and more, and soon, the massive appeal of the fandom was born and it had begun to spread everywhere.
Now having said all that, I want to emphasize that I'm speaking in a broad sense. The Furry fandom has obviously had fights and problems just like any other fandom. But quite honestly, it's impossible for us all not to, sometimes. We're not perfect at all. And the fandom of course isn't going to solve all social problems at all with a wave of it's furry hand. Nevertheless, these two effects are very heavily present in this fandom, sometimes even to an intoxicating level.