Where did i say shut up. I offered some possible reasons why Mueller didn't want to make a stink over Barr's toadying. You want a few more?
Barr's wife and his wife are friends. Barr loaned him money when they were younger and Mueller owes him a favour. Mueller doesn't give a shit if someone else lies. Mueller had a stroke and can't talk. Mueller isn't answering his phone. Any of those work for you?