What I hear about Kennedy is pretty mixed I must say. Some deem him wonderful, others claim that those who think he's wonderful only think that because his assassination shocked the world. Since my parents were still kids when the assassination took place, you can imagine I wasn't there... What I do know is that at least according to some experts I heard, is that Kennedy acted a bit on an impulse when he threatened with the nuclear bomb because of the Cuba crisis, bringing the world in serious danger in the process, but they also said that could have been lack of experience. And they did bring it up, because Trump's administration is also a bit based on many impulses, and some analysts claim that Trump manages to send his tweets at times his advisors can't stop him... Nobody can tell how Kennedy would have been....
Of course, when it comes to the Iran story, he already criticized Obama for the atomic deal before he was elected, and we all knew that canceling the deal would bring destabilization. Not sure if the deal was a good deal, but just canceling a bad deal without considering the consequences is not very smart either, and if this really results into WWIII (I'm not too sure if that will happen now, but hey it is a possible worst case scenario), I deem it likely historians will put all the blame on Trump and not on the Iranian regime, and I wouldn't want to go down into history with that on my name.
Of course when it comes to successes I am also careful. It's not unusual an administration (of any nation) can harvest the fruits of their predecessors, but will claim all honor to themselves. I can't imagine there are no things Trump could get done thanks to Obama's work before him, but I will have to dive deep into matters to find out what is Obama's work and what is not. (And it's also not unusual for an administration to be blamed for the errors of their predecessors, but I am not sure what errors Trump gets blamed for are really Obama's... Trumpies never gave me a good example).
Truth is that social media is a threat to politics world wide including but not limited to the U.S.A. And I guess this shows what happens if anyone can just post everything unchecked, and why there is a limit to the freedom of what you say out the open (nothing new, but now that the limits become clear, people whine about them). That combined with more of Trump's deeds (either good or bad) at least he did (unwittingly) teach us some important lessons, I suppose.