Their career is being targeted, their position of being a really influential and highly regarded tenured professor is being targeted. But having this career is not a human rights, it‘s a privilege. And they can use this privilege to protect weaker members of society, like students whose rights are actually threatened.
If Norman Finkelstein is not in danger then they are definitely not in danger.
The only thing they are protecting is their own career which is weak. What makes it contemptible is that they built their career on sitting on their high horses about what to do during an authoritarian power grab, and then do exactly the opposite of what they have been preaching. Choosing this field of study means (in my opinion (with which you can disagree (and most people here apparently do))) that you have extra responsibilities.
How does my comment in any way infringe their rights to leave?
A lot of unpronounced letters are actually pronounced conditionally, for example in “Je suis un homme” the last s of suis is pronounced because it is followed by a vowel.
Ukrainians were/are still fighting to defend themselves from an illegal invasion. But America sees and has always seen Ukraine as a proxy to weaken a geo-strategic rival. NATO was not realistically on the table as long as the conflict in the Donbas was ongoing (it would have immediately triggered art.5) to keep promising NATO instead of working on a more realistic path to peace has probably caused the death of 100000s of Ukrainians. And just as with many other imperial proxies in history, the proxy is left to deal with the fallout while the empire retreats to the metropol and prepares for the next conflict.
They could stay at Yale, they could keep writing and doing research to their best conscience, and then make as much noise as possible if someone tries to stop them.
They could help organize, help protest when academic freedoms are being attacked, or anything else, except flee at the slightest bit of resistance.
Bernie Sanders and AOC have shown that there are tens of thousands of people in almost every US city willing to get onto the streets to resist Trump. So they will not be alone, and then if things get really hairy, then they can flee.
And besides that, they are the self-proclaimed fascist experts, so they should be able to think of many more effective strategies to resist authoritarianism. But I doubt any of their proscribed strategies is for the elite to pack their bags at the first inconvenience.