I'm not opposed to circuses per se. I think Cirque du Soleil, for example, is a wonderfully exemplary model for how a circus-like show can provide great, colorful entertainment without being in the least exploitative of either people or non-human animals.
I'm not even necessarily opposed to the employment of animals within circuses, assuming that they truly receive humane and enlightened treatment. But elephants, so very intelligent and as emotionally nuanced as human beings, should never have been used in this kind of context.