I think you are missing another possibility (on your 1 thru 5). They all know, at some level that this is wrong, but everyone around them is going along with it - and those people who don't go along with it are crushed, lose their funding and careers etc.

I have personally witnessed this, working in government. There was a bad thing going on that essentially everyone knew about, and would all agree was terrible (it was really bad) but 100% of them still went along with it - hundreds of people, including plenty of "scientists". I was literally the only person who didn't - but nobody would know that because I got pushed out.

It's natural human behaviour - we evolved so that the vast majority will follow the crowd and do whatever everyone else does, no matter how nonsensical or cruel. History and psychology are completely clear about this, eg Milgram experiment etc where people do totally ridiculous things, or take action that is apparently hurting people, apparently without limit as long as they think its expected. It's extremely difficult and rare for anyone to go against this.

But there are indeed dissident scientists who challenge AGW but they have all been vilified or silenced - and you certainly won't see them on mainstream media unless its in some kind of hit piece to try to destroy their credibility. Egs: Judith Curry, Willie Soon, William Happer