But we may also lose the next potential Einstein by NOT firing them, based on victim stories we know this is the kind of behavior that convinces people to leave institutions or even the entire field itself.

When looking at historical figures context is everything. I judge men who sexually harassed women in the 80s way less harshly than men who harass women today, why? Because in the 80s society still told you, 'this is ok, this is normal, feel free' for many forms of sexual harassment. That doesn't exempt them from culpability but given the degree of effort that would have been necessary at the time to understand what was wrong with their actions we should temper our condemnation of them.

The point this leads to is: If Feynman was alive today, sexually harassing women, that's significantly worse than similar behavior in his heyday; making your question hard to give a meaningful answer to.