Don't try to distinguish between grifters and useful idiots

Focus instead on finding with other open-minded people and learning with them— in other words, Teach people shitTeach people shit
Just because it's fun.

But if you need more reasons, because it's a good way to Cultivate a connection with other beings, and if it's paid, it has the potential to help Decouple income from ...
, Learn new shitLearn new shit
Just because it's fun.

But if you need more reasons, gaining more knowledge is a way to Increase optionality. And learning is a prerequesite to being able to Teach people shit.
, Cultivate a connection with other beingsCultivate a connection with other beings
Just because it's fun, and a great way to Increase optionality and Learn new shit.

It's a way to Seek win win wins, since every win-win-win requires 2 other people.
.

Trying to identify bad faith arguments is lose lose lose.

If you successfully identify a grifter, what has changed? You can judge them even more harshly for their cynicism, but isn't it enough to judge them for their harmful words and actions?

If you successfully identify a useful idiot, what has changed? You can judge them slightly less for their harmful words and actions. You can consider them redeemable and attempt to change their mind. Is that a good use of your energy?

If you fail to determine for certain whether someone is a grifter or a useful idiot—and uncertainty is the most common outcome—you've simply wasted your time.