You see this conclusion often, the J6 insurrection was a threat to our democracy.

It very much was a threat to our democracy. Anytime a sitting President decides to pull a self coup - that's a threat.
(A self-coup, also called an autocoup (from the Spanish: autogolpe), or coup from the top, is a form of coup d'état in which a nation's head, having come to power through legal means, tries to stay in power through illegal means.)

But lets make a thought experiment and assume the J6 insurrectionists...
No. First, saying something is a threat to our democracy is not the same thing as saying we lost our democracy. I think most people can see the distinction.

Second: Let's stick with the dumb not well thought out loose plans that seemed to exist. One is the alternate slate of electors is presented, now let's say all of the state legislatures in question throw in with the scheme and they are presented to Pence, and Pence accepts. Chas ensues. If this happens would you call this a threat to our Democracy? I would. I think most people would. Where are we? I think to the USSC.

Then another loose plan was enough chaos would be generated that somehow the election would be tossed into the 12th Amendment. I've looked and I don't see how, but let's say that did occur and a vote was taken and Trump wins. Is this a threat to our democracy? I think so. Where are we? I think to the USSC. Would this be a threat to our democracy? Yes.

So if an attempt to rob a bank fails, moronic or not, there was no threat to the bank?

I haven't heard a liberal say we've lost our democracy yet - just warnings. I have heard - if Trump gets elected in 2024 we've lost our democracy.

Make no mistake Mike, Jan 6 was a coup attempt, there were insurrectionist elements in the crowd and we've imprisoned some.