Just asking seems a little to plain to work

If the simplest solution works, then, well, it works. And if it doesn't... I don't really see any negative consequences of failure.

Now I'm thinking maybe I should gather a couple of those people and someone who is less inclined to change his mind and try to "convert" him by providing an environment in which it is ok to be mistaken and good to be corrected... Then I just repeat this process inductively until we take over he world, don't I?

It'll work for some people, not for others. You could try, I guess, but people change slowly so it could take a while.

I think that trying to force it could have ethical problems. But inviting someone to have a chat with you and your friends shouldn't have any such problems.

I don't have it, but I will have it soon enough and see how it goes.

Good luck!