Why hasn't Ozzy Osborne sued the Westboro Church for changing the lyrics to "Crazy Train" and singing them on?

TV on the steps of the Supreme Court. Fred Phelps and his attorney kids are the freaks who picket our dead soldiers funerals and they have made evil lyrics to "Crazy Train" Do you thing Ozzy should go after them and sue them since they will be getting money for lawyer fees from the dead soldier's father when the Roberts court upholds their freedom of speech rights?