Interesting observations, Frédérique. I suspect that, like the CD community, the furries community has a broad spectrum of reasons why they do it. I do know that some feel that the animal they dress as is truly how they feel inside, for other though it might be just a bit of escapism.
Personally, I think that folks tend to be be more tolerant of furries in that they are a relatively new phenomenon(?) and not a threat to their own sexuality. Even if they don't get it, they can let it go for the most part. Of course there's always some folks who will immediately start in with name calling - I would guess out of fear of what they don't understand?
However, when these same folks see a crossdresser many do not know what to make of it. They have that instant reaction to seeing a man in women's clothing and all of their own cultaral baggage and beliefs that might come with it.