You are describing a way for the government to punish people without due process. "Oh that guy, he's a loon, let's lock him up." > we don't want to return to t

You are describing a way for the government to punish people without due process. "Oh that guy, he's a loon, let's lock him up." > we don't want to return to the bad old days when people were locked up for all sorts of unjustifiable reasons. What makes you think this would no longer be the case?