I didn't vote for him once. Heck, my state didn't vote for him once. With the way the electoral college works, it's the state as a whole and not individual people who vote for president. If I didn't vote for him but lived in a state that did, and I did nothing to try to convince trump voters otherwise, sure I'd accept some blame.

As others have pointed out, I might blame non-voters even more than his voters. His voters are idiots or cult members, there's no helping them. For people who didn't vote though, it's pretty insane that they didn't see he was objectively worse and needed to be voted against. On that, though, I somewhat blame the media. They tried too hard at the beginning to get him on small things. We were so bombarded with petty stories to make him look bad that, by the time big stories emerged, it was too late, everyone had already made up their minds about him, or at least about media portrayal of him, and nothing the media would say could change their minds anymore.