This old truism which seems to have been forgotten may be restated as two wrongs are both wrong, will always be wrong, and will never make a right.
No one can justify or accept bad actions or behavior by a second bad action or behavior. We all get desensitized by all this bad behavior, but never lose sight of the fact, that it is still wrong, and it would be best if we would stop using it to defend our positions.
Teach your children well.