No. I'm no fan at all of the US regime and the atrocities it committed, but these atrocities aren't a free pass for other countries to commit war crimes and remain criticism-free.
The fact that Blackwater exists doesn't make Wagner any less evil. Whataboutism is using one to shut down conversations about the other.
People now counter any claim like this with "that's whataboutism!". It's free reign to be be hypocritical I guess.