Everyone always agrees that that truth-seeking is good. The only thing people disagree on is what is the truth. Trump presumably feels this is a good line but that the truth is that he's awesome. So he'd oppose any LLM that said he's not awesome because the truth (to him) is he's awesome.

That's not true. Some people absolutely do believe that most people do not need to and should not know the truth and that lies are justified for a greater ideal. Some ideologies like National Socialism subscribe to this concept.

It's just that when you ask someone about it who does not see truth as a fundamental ideal, they might not be honest to you.