I have never understood how pointing out another unethical policy justifies the first unethical policy It seems we as a society have lost the axiom of "2 wrong

I have never understood how pointing out another unethical policy justifies the first unethical policy It seems we as a society have lost the axiom of "2 wrongs do not make a right" as it is not just this area were I see people attempting to justify their wrongs based on the wrongs of others...