I suppose the body count is the main difference. And obviously there were ideological differences; McVeigh was interesting in revenge on a government that he felt had abandoned its original purpose and ideals; Ayers wanted to simply overthrow that same government and replace it with a completely different system. But both had ideologies that led them into violence, both committed acts of terror in service of their ideologies, and both are responsible for the deaths of innocents.
Only one of them got what he deserved after his crimes; McVeigh was, of course, executed. Ayers is a free man due to a mistake by law enforcement in the investigation of his case. And of course, because Ayers' crimes were conducted in the service of a leftist worldview, he is not only
not ostracized, but rather
welcomed into the polite intellectual circles of the left as something of a folk hero. He now spreads his vicious ideology as a Professor at the University of Illinois - Chicago.
And, apparently, mentors Democrat presidential candidates. What has happened to our society?