Yeah, they do.

The election is what defines the legitimate government; if it really had been falsified[1], then anyone who participated in the falsification would be a usurper, and the government instated by the falsified election would be fake. If something like this actually happened, then it would hardly be insane to consider it your patriotic duty to put a stop to it.

The metaphor is overused as hell, but it is apt: Trump shouted "fire" in a crowded theatre, and now he's acting all surprised that a few people got trampled in the rush to get out.

Anybody who believes him at this point obviously has brain worms, but being a notorious liar doesn't exempt you from libel and sedition laws. It is also irrelevant whether the mob sincerely believes the election was stolen, or whether they're using it as an excuse; slander is still slander.

[1]: Using ad-tech to manipulate the way people vote, as the Cambridge Analytica conspiracy theory alleges, is not falsification.