I don't see what's wrong. He says it publicly and everyone jumps on him, when you know he's thought about it even before Nadal's injury. I hope Murray breaks his ankle for instance, and cries like a baby on court. I hope he recovers quickly, but it would be hilarious to watch him break down, and whine in the fetal position (No more Djokovic/Murray finals please).
I hope tons of people get injured all the time. I hope certain people at work fall ill and die.
The problem is that people are so quick to jump on anything that isn't 100% politically correct, when they themselves have thoughts like this all the time.