The same value as finely parsing whether you are the same person as Stalin or whatever. You are viewing your enemy not as a bunch of flawed or even mentally ill people, but as some movie villain or even not-reall-humans. This is a problem. That's how you start down the path of justifying genocide. When the right becomes crazier, the solution is not for the left to become even crazier and starting some arms race of who can be most insane.