I would disagree somewhat on Iraq, Bush's justification for the invasion was WMD, and the UN personnel knew damn he had none, and none of course were found hence the ICC declaring the invasion criminal. As one experienced American weapons inspector associated with the UN put it, "we know he used to have them because we have the receipts, but he gave them all up during the previous inspection"
At the risk of derailing the thread... I never said the invasion was justified due to what Bush said. There were other issues going on... Saddam's continued support of terrorism (e.g. payments to the families of suicide bombers), continued suppression of his own people (the latest was his actions against the Marsh Arabs, which continued right up until the invasion, so it wasn't some long-past event.)
As for the WMD, keep in mind that at the time the argument by those involved usually was not "We know he doesn't have them". The argument was "Give us more time". (And Saddam wasn't fully complying with the demands of the weapons inspectors. Basically he was bluffing, and ended up getting caught on it.)
I totally agree on Trump. James Clapper's recent comments about Trump's wild gyrations were especially chilling when he focused on his access to the nuclear codes. I'm old enough to vaguely remember that doomsday clock thing and I hate the idea of going back there.
Someone suggested increasing the length of the nuclear launch codes to over 140 characters so Trump couldn't accidentally tweet them out.