Sure, but once you've conceded that yes, CrossFit has an unusual increased risk of a disorder both deadly and detrimental to fitness, then you need to deal with objections that CFers would be better off with the next alternative: CF can't be the only type of working out hard, even if it prides itself on being the hardest work out around.
More rhabdo among CrossFitters is like saying there are more drowning deaths among those who go swimming.
Modus ponens, modus tollens. That may just be a reason to avoid swimming as one's recreation unless one prefers it so much compared to the alternatives. 'Drowning' and 'rhabo' seem much worse than 'shoulder issues' or 'knee problems'.
Conceding there are risks inherent to CrossFit (or anything) is a good reason to consider alternatives. Then, you'll see the alternatives have risks, too.
Then, you may personally decide to partake in any activities for which you are willing to accept the risks.
And again, CrossFit isn't a magical, dangerous thing. CrossFit = a branded mix of strength/speed/endurance exercises. You can do it reasonably, or over-do it.
Rugby or football, on the other hand...
Here's an internal dialogue I just had.
Q: How do we test rationality skills?
A: We haven't come up with a comprehensive test yet.
Q: Maybe we can test some part of rationality?
A: Sure. For example, you could test resistance to akrasia by making two contestants do some simple chores every day. The one who fails first, loses.
Q: That seems like a pointless competition. If I'm feeling competitive, why would I ever skip the chores and lose?
A: Whoa, wait. If competitiveness can cure akrasia, that's pretty cool!
Now we just need to figure out how to make people more competitive in the areas they care about...