I think there must be assured ramifications for an abuse of power when people vote in bad faith, without a basis in fact and in ways that foreseeably cause death.
Stalin did not purge, his army did. Is he not guilty?
You might not like the RICO statute. Or conspiracy, or the crime of attempt.... I don't agree with your bright line test.
There was no part of what Cruz did that day that is even remotely analogous to that, nor is what he did that day (suggest an audit that could be performed before the inauguration, then vote against certification) even close to causing folks to attack the very building in which he was working at that time. It simply is not what you say it is, and that you even try to suggest that it is the same is where we will forever have a disconnect.
Cruz did nothing like what you suggest here, he was not part of a one party system, he didn't send out the military to kill folks, and he voted in what he believed in.
The reality is: Everybody who voted, even those who voted a way you didn't like, rather than took up arms was doing exactly what the constitution said they should do in a forum where such a vote was supposed to be taken, and in a way exactly as described. Nothing that they did there that day was "insurrection" any more than folks who voted for Trump on election day were "guilty of treason"...
People in the congress get to believe and vote differently than you or I, all the time, every time, and especially in places where the constitution says they get to vote.
That you think somebody should face prison for doing exactly what the constitution says they can and should do just because you didn't like what they did is cause for alarm. I can't believe that Americans would ever suggest that folks that vote or think differently should be put in prison or camps. It disgusts me.