but that's just it, they didnt.

let's look at the case of hungary. the respectable conservatives and the fascists murdered hundreds of thousands of fellow hungarians.

the evil russian hordes that conquered the country... didnt. they did super minimal purges. sadly, they let the vast majority of the fascist scum live.

so no, preemptively doing mass killings because the other side would do the same is a fascist/colonialist/racist myth.