His great-grandmother was a refugee from the Nazis, most of her children were murdered in the Holocaust. Do you think perhaps his tears were real?
His emotional lability is not connected to his grandparents' back story, but probably to the heavy portent of what he had chosen to do. In other words, he was overcome by his own virtue signalling. It's a known phenomenon in psychology; it has a name but cannot remember it.
Don't forget, however liberal Schumer is, he is Jewish and the people he was speaking for are not well-disposed towards jewish people or to him.
I don't mind debating with teenagers, but if you are going to swallow what you read in the workers rev party newspaper, then it will not be possible. My grandparents were prisoners in Nazi camps until 1947 - but that is no reason to take the stance that Schumer has.
Having a liberal outcome in life is a good thing, but deliberately not seeing the full picture of various situations is just plain stupid. As an individual, would you deliberately put yourself in potential danger just to be seen doing 'the right thing'? For example, people who work with parolees know that however much you want to conduct yourself as naturally as possible with them, you still hv to take precautions.
You probably haven't heard of the Scorpion & Frog fable - check it out, it puts the finger on why having a kind, open and liberal philosophy should always be tempered with caution.