I am not even on the fence,I fell off. I don't encourage people to cave dive,but will make myself available to answer questions and mentor. Between losing a couple good friends in cave diving accidents,to having some "come to Jesus moments".I would feel awful if someone got into cave diving because of encouragement from me,and the sport really wasn't for them,and they drowned. Cave diving looks so benign and easy,until something really goes wrong,and as much as you can discuss it on forums,you really don't know how you are going to react. It is fun to learn a new skill and want to share it with the world,but unfortunately this isn't gourmet cooking.
I'll add another +1. A lot of times, the response I get when people find out I cave dive is "Oooh, thats scary!" or "I've never tried that, I'm not sure I'd like it."
My response to them is that it's not for everyone. And if they think it's scary, or don't have the training they absolutely shouldn't be trying it. I think cave diving requires a certain mindset. If you're just looking for a thrill, or an adrenaline rush, go find a cliff you can jump off of instead.