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That is usually how a genocide is justified to the public. Every member of the ‘undesireabe’ group is guilty of being an undesirable, and can thus be justifyably murdered.
Examples:
All Jewish people are guilty of some conspiracy and/or killing Jesus
All Muslim people are guilty of replacing white christians and/or terrorism
All LGBTQ people are guilty of grooming kids
All Palestinians are guilty of ‘occupying’ Israeli land.
etc.
Every example of this is a tool of propaganda to get the public to go along with unfair treatment up to and including genocide. The fact that they’re all easily refuted doesn’t matter. It goes hand in hand with the view that the group aren’t fully people.
This reasoning is never ok, no matter what group of people it’s used against this time. When you recognize it, call it out for the sham it is.
Thousands compared to a population of over a million is very negligible. Even if every single one of them actively targeted civilians. ‘A negligibly small percentage’ is sometimes colloquially referred to as ‘practically zero’.