Whether you're an animal rights activist or not, the fact of the matter is EVERYONE thinks it's wrong to abuse animals. People will go to great lengths to pretend animal cruelty isn't happening and the circus relied on secrecy over how its animals were treated to survive. Once video started coming out, it was the beginning of the end.
If you haven't seen any of the undercover videos and have doubts, a quick google search will find hundreds. For example: https://www.youtube.com/watch?v=ECspj0daAlE