http://news.bbc.co.uk/1/hi/uk/263864.stm
I'm sure there are many people who, as children, enjoyed watching animals perform, but are now totally supportive of animal-free circuses. I know I am. Some of the training methods were crude and cruel.
There are many other areas where animals are abused for peoples' entertainment. Dancing bears, for example.
Call it political correctness if you like. To my mind it's more a case of giving respect where respect is due.