I get what the OP is saying (though I'm not sure I'd go quite a far to act upon it).
We all tend to rationalize that if we're hurt or worse it was "doing what we loved." But in fact, there's a lot more to life than burning dead dinos while accelerating, braking, and turning a machine.
We only say it's worth the risk because we don't really think it will happen to us. If someone told me I could ride for 10 years, but the price to pay was becoming a quadriplegic or death, there's no way that's worth it. Life is too short already and so rich with other experiences that riding is trivial in comparison.
Of course, that's not the deal we make. We trade the rewards for the *chance* of these outcomes (though we probably underestimate those chances).
So we enjoy the reward and take the risk, in part because we really only think of ourselves. We think about how WE would feel if we were paralyzed or died, not the impact on families or friends. So it's a selfish decision.
So if we're okay making a selfish decision for ourselves, it's natural to continue to make selfish decisions. If I was a parent I can see trying to shelter my kids from becoming part of the carnage we see every year in our community...primarily because I wouldn't want to live the rest of my life with that loss, and knowing I got them into the hobby that killed them.
Selfish? Yes. Hypocritical? That too. Honest? You bet.
That said, there's a difference between thinking like this and acting upon it. Just like I want others to respect my decisions, we have to let them make theirs. And I imagine the hardest part of parenting is letting kids try things that their parents wish they wouldn't. Still, that doesn't mean we have to encourage friends/families/kids to try things that put them at risk, even if we take those risk ourselves...