Is viewing or purchasing beastiality videos legal in US?

It depends on which state. I don't think it should be illegal at all, bestiality and animal abuse/rape are two different things.

I sure hope not. Cuz I'm Hrony.

Yes, loads of people watch them all the time on youtube.

This answer is nonsense. There is no state in the US which permits bestiality.

Unless you have permission from the game's copyright holder, it's technically probably a violation of copyright. You'd have to have a compelling "fair use" exception to the copyright protection for...