But where does your line get drawn and who gets to decide what "too dangerous" is? This is just ripe for abuse. There are many ideas that are considered a threat to the current regime of a country and in many cases there is the suppression of those ideas that threaten the status quo.

Also, I think it may be a mistake for you to think that you are the first and only person to have come up with most of your "dangerous" ideas. Open conversations about potential threat vectors is a much better proposition than trying to sweep it all under a rug, hoping some "bad actor" never arrives at that same idea.