"You have been told, O mortal, what is good, and what the LORD requires of you: Only to do justice and to love goodness, and to walk humbly with your God."
CCC 1807 (The Virtue of Justice)
Whether you loved or loathed Mueller's investigation, the man spent decades doing work few wanted and fewer understood, then went quiet when the spotlight got loudest. The Catechism defines justice as "the firm and constant will to give God and neighbor their due" (CCC 1807). Silence after public service is its own kind of witness.
Reflect → Could you do the right thing and then never get to explain yourself?