From his lawyer, quoted in the JS article:
O'Donnell, Quarless' attorney, said he opposed the anger management class in court but ultimately accepted it as part of the sentence.

"We're gonna do that but not because he needs it. The case had nothing to do with anger. It was just a stupid thing," he said.
Unfortunately there is no such thing as a "Stupidity management class". He could sure use that (sadly along with millions of others).