We left the topic of 1930s Europe already, buddy. You asked, in very general terms:
How can we know how much paranoia is ideal?
You just don't like people bringing up Jan 6.
I don't like trite answers with no roots in reason or principle to be utilized.
I'll answer for me and you can keep hiding under a rock.
The ideal level of paranoia is the amount that prevents great violation of rights than it causes.
Reason is man's only means of knowledge. We know what to fear by reason, and when the evidence of history both ancient and contemporary is rationally analyzed patterns of behavior both individual and collective emerge.
One of those patterns is that censorship is never done by people who can win the argument. Another is that when a series of so called coincidences always serve the interests of a particular community it's probably because of a conspiracy.
Want an example? The removal of native Americans. You know they never just said "Well we want this land so get out", always there was some series of events; some complicated story that ends in war that ends in land annexation.
The vast majority of the left-tribe now takes for granted this is a conspiracy, that is they have a conspiracy theory... and in this case they are right because logic rules other possibilities to be unlikely due to the number of simultaneous coincidences.
The conspiracy looks like this: Never waste a crises, use any excuse, distract from your crimes and emphasize the enemy's, never give up what you've taken.
Conspiracies don't have to be complicated. The truth of them often leak out all over the place. Hitler basically outlined his plan in a public book, and people still didn't believe.
You told me it must be terrifying to believe in all the conspiracies I do. Yes, the world is terrifying; and one of the most terrifying things about it is that people like you (for some reason I cannot comprehend) cannot learn from history. You put a barrier up in your mind between the past and present, thinking that somehow the forces which shaped history are no longer present.
Conspiracy has been ever present in our past. To believe it no longer exists is a terrifying act of voluntary ignorance.