The first part of your post does not apply to POTUS. The second part is pure opinion.
In many cases it is.
Correct, it can often be permanent, with regard to classified information. But the day you leave the government, you can say and do all kinds of things you couldn't before.
But hey, what's your opinion? Does Trump get to threaten the Bill of Rights with impunity? Is 1A not as sacred as 2A? Is it ok to verbalize subversion of the constitution, as long as you caucus with the right party? If you're going to give Trump a pass on this, I can see where you picked up the Blue Falcon moniker.