No one really goes into an interview speaking about politics, or propaganda, or unionizing. So there isn't much signal in telling people to not do that, most already bend over backwards to look like an ideal candidate.

Telling people to have a good attitude is easy to say, hard to do when you've been applying for 6+ months with no response and bills to pay.

Unfortunately, the advice that's most likely to help is something everyone already knows. Networking, practice, and luck play a huge role in a environment like this. And cut expenses as much as possible, just in case you need a cash cushion.