I have no idea where you get that ridiculous "conclusion" from.
Generally from this:
But we'll never know how many kids had life-changing injuries as a result of doing those things. Yes, many of us survived the experience with no serious injuries, and are probably better able to assess risk nowadays because of it, but the relevant statistics weren't kept in similar detail when we were kids to know how many didn't get through it.
Because the statement is based on something we'll "never" know. If we mandate safety on the basis of something that "might" happen, the logical conclusion to that argument is that we shouldn't do anything risky.
But something "might" happen in any activity, in fact
@Oldhippy 's suggestion we get experience from YouTube is a bit, well, risky; think of the danger of electricity, of cables as a trip hazard, sharp edges of tables, and the possibility of the flat screen monitor falling on you.
That may not be what you had in mind when you suggested it, but the logical conclusion of the argument is that we try to stop all risk, which means we stop people doing risky activities.
This is why risk assessment doesn't work like that. A real world example: if I have a wheelchair bound client with medical condition spasticity and she wants to visit a forest, the immediate reaction of her family may be to dissuade her because of what "might" happen; She might be tipped out of the wheelchair, she might roll down a hill and get hurt. These are not unreasonable fears, and come from a position of caring for the client, but we can't tell her not to join an activity because of what "might" happen, so we do risk assessments to see what is a likely risk, what is a dangerous risk, and what we can do to mitigate it*.
The alternative, which sadly often happens, is that out of an overzealous, if understandable concern to protect someone with disabilities we prevent them from experiencing things they could otherwise be a part of.
In the same way, to try and protect cyclists by insisting they do things like wearing helmets or by stopping people cycling at all, can stop people experiencing the mental and physical health benefits of cycling. If we are going to do that, we have to have proper assessment of the risk; it's likelihood and level of danger, and then how to mitigate it, not insist people change their behaviour because "You never know."
*And the risk assessment showed that the most dangerous thing to do, by far was... drive to the forest.