What I would’ve liked was if someone had killed Stalin in the 1910’s or 1920’s, before he began his reign of terror.
How about ganking young Karl Marx?
What if a Jewish customer bought some of his paintings while he was still in Vienna?
Wouldn't have fixed anything, because there would have been someone else who would have taken Hegel's dialectic and run with it the same way. You would have to take out Hegel, except that would require taking out perhaps Hume, or going back further and taking out Descartes because without Rene there wouldn't have been the modernists, and without the modernists there wouldn't have been the post-modernists. Or you'd have to go back further and take out Thales of Miletus, because without philosophy there wouldn't have been modernists to set things up for the post-modernists.
Bottom line: the only time travel assassination that would make any sense would be to go back to the garden and take out the snake; otherwise, sin runs its course, one way or another, until it gets removed by Jesus' return.