You'd think, but many vegans aren't. 

I think it's fine, from a vegan standpoint, but they'll talk about how that stuff is supposed to circulate back into the ecosystem.

Undisciplined

i guess that's the hard part, is it ok if the animal that dies naturally lives on a farm? if not, it would be very difficult to find a dead wild animal before another living animal made a meal out of them

Probably, assuming they felt confident that they died naturally.