if you feel that strongly about it, then spend your free time educating people about it.
but activities which don't affect anyone but the individuals who are choosing to participate should not be regulated by the state.
the article you linked has a tragic outcome, but I suspect you're not in favor of ending military service, law enforcement, long-haul trucking, underwater welding, or working in an oil field (all of which have meaningful risks). Let's pass laws to keep industries safe, but it's hypocritical to prohibit one of these and not the others based on some paternalistic notion of what's best for the individuals involved.
* I think your last paragraph was an edit, and I'm sorry about your friends' experience. It sounds genuinely terrible. But without more detail it's impossible to speak to those circumstances. There are people in all walks of life who are predatory, and the individuals have to be protected by the law when they say "no!", but it's an overreach to say that because some people wish they said "no" when they didn't then we need to prevent others who might have been happy with that choice from having the option. By that reasoning, we would have to ban all employment, because a boss manipulated you into trading your youth for a dead-end job at $15/hour.