He doesn't want to have to stand up, turn around and apologize to parents on behalf of an asleep at the wheel Congress again.
At some level I don't blame him. It is also a bit strange how in that act alone he showed more accountability than most of the politicians that were questioning him, never mind most executives. I suppose Josh Hawley wants to be liable for personal lawsuits for his acts of Congress too... people cringe at his "robotic" demeanor but I can't remember the last time someone turned and faced people and apologized like this. Most people asked to do the same (even in front of the same body) never do.