Is there a name for this phenomenon? I've taken to calling it "the nihilist's excuse"
Similar to false dichotomy. "If we won't do it, <other evil guy> will".
I call it race to the moral bottom.
Related: https://www.youtube.com/watch?v=KNqozQ8uaV8
Similar to false dichotomy. "If we won't do it, <other evil guy> will".