The famous “First They Came” Niemöller poem is sometimes incorrectly reduced to say “first they came for the socialists” instead of “first they came for the communists”, which I strongly disagree with, as the usage of the word communist was a specific decision, as that term describes a group that people instinctively didn't care about at the time.
Take a group and make it so people instinctively won't care about them, such as immigrants, “activists”, communists, muslims (“terrorists”, “jihadists”, “islamists”). Then, begin expanding that definition.
To fascist Laura Loomer you're a communist if you have pronouns in your bio, and she doesn't care about dead communists. After all, they're criminals, inherently they must be and hence any action against them is justified. Make a group of people synonymous with crime and then their subjugation can be framed as justice.
Renée Good had kids and never even participated in any protest. But she's a communist and deserved to die, right? After all, who cares for dead communists?
Remember, not so long ago the same people told us we need to mourn Charlie Kirk, and anyone mocking his death, or even just pointing out the fact that his death was the result of the world he created, was subsequently fired from their job.