My random thoughts
If they are adults, they should ultimately have the freedom to kack themselves. I don't want the "police" telling me I can't dive a certain site because I don't have a sidemount card or a scooter card, etc.
If I bar them in some way (intimidation, threats, etc), they'll just come back when I'm not there.
If I talk to them, explaining (hopefully without preaching), the dangers (the "real" ones not just "you don't have training, you'll die" ones), then hopefully, they'll make a good decision. If that's not sinking in, I'll move on to how nasty cave divers can be to OW divers that screw up and get cave sites closed. The things we'd do to your dead body...
I practiced on my teenagers

I figured out that once they think I'm preaching to them, or getting all authoritative, they simply stop listening.
It's even worked a couple of times, and I have never been happier than when one person I'd talked to in that situation came up to me later down the road and proudly showed me his new cavern card.

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