Most furries are harmless. A few are creeps with no concept of boundaries. Some are particularly deluded Nazis. Like every group of some size, they have a certain percentage of scum. Depending on your standards, they might be weird, but I'll take harmless weirdness over harmful normalcy any day, let alone harmful weirdness.
We're actually some of the larger donaters to animal based charities, I've yet to go to a furcon that didn't make 10s of thousands for endangered animal rescue.