Peter Dickinson is a very high-leveled proffesional in the world of zoos, he worked in that industry for over 40 years. What credentials do you have other than hearing likely tampered words from Craig's mouth?
The Romanian Lion Case is completely different, and whilst I don't think they should be killed, the circumstances are completely different from Craig Busch's affairs and is a lame excuse for a come-back.
EDIT: And whether you like circuses or not, it's proof that Mary Chipperfield was highly abusive to animals in her care, specifically chimps.