I see several things there...not all of them line up real cleanly.
Warren - clearly to me, she is grandstanding and trying to trap the guy with her questions. She isn't really interested in what his responses are, she just wants to "gotcha" him in front of the committee. For what reason? If he had answered every question the way she wanted him to she still would not be voting for his confirmation, IMO. It would seem that she would like to position herself as the "outsider" in her quest for POTUS.
The one question/challenge that she posed to him that bothered me the most is the 4 year voluntary hiatus from working in defense after leaving government...it sounds noble on the surface...but realistically, where is a guy who has spent his career working in the defense industry and steps out to "go to Washington" going to get a job, post-Washington? McDonald's? LOL. What means would someone have to support their family if taking a gubmint job then meant you would be all but unemployed for the 4 years following that ride?
That being said, I would likely find myself in agreement with her that there is too much coziness between DC and such a gigantic part of our government expenditures, the defense industry. Now then...how to go about making sure the fox isn't guarding the henhouse? Made for sound bite questions in a Senate hearing probably isn't it. But at this point in our country's governance, what route is viable??
Nominee - he clearly was fully prepared for her, whether that is a good thing or a sign of the problem is a matter for debate IMO. Where, if not the defense industry, would we like to source our highest level government overseers?
I think you just about have to have people from the industry to have any idea what they are in charge of...but how do you keep them honest then? There are committees and protocols in place to do so, and he appears to have submitted to them, so then what?