User blog comment:Moskvin/Red Alert Universe Timeline/@comment-1584932-20150202043708/@comment-3998750-20150321232145

Quote: "If Einstein erased Hitler in 1924, Germany would not go Nazi and Einstein wouldn't need to escape to United States to create a time machine to erase Hitler anymore in present"

And that is the famed temporal paradox. In RA1s case - since Hitler is erased, Einstein would have no need to go back in time to erase him.