Well, we know for a fact that McCain thinks blowing things up is a good solution (bomb bomb bomb, bomb bomb Iran).

But we also know that Ayers no longer favors blowing things up as a means of solving problems, and he didn't favor it back when Obama had some sporadic contact with him either. He did stop doing it, after all, and I think many people probably don't know that Ayers turned himself in. He was not captured. He was living underground, and just he decided that it was time to turn himself in. That means that he was prepared to serve time for his crimes, which means that he wasn't entirely unrepentant.