Do you do it?
No.
You would be harming another human being without expecting any benefit from doing so. Punishment is only justified when it prevents more harm than it causes, and this is specified not to be the case.
Our sense that people 'deserve' to be punished is often adaptive, in that it prevents further wrongdoing, but in this case it is purely negative.
What about the schadenfreude fom pissing off Hitler?
Of course, he might become even more psycho from it.
Here's an edited version of a puzzle from the book "Chuck Klosterman four" by Chuck Klosterman.
When should you punish someone for a crime they will commit in the future? Discuss.