Maybe they see it as a trap. Maybe the rightly see that after supporting the burning of the country (an actual insurrection, let's be real) or when they invaded Congress more recently (applying their same rules to them, that was an insurrection) or when they made Trump enter a bunker or whatever because of their rioting (insurrection after all).

By the same rules they are trying to catch Trump in, many Democrats are guilty of. To go this far is something that could be applied to them.