At the risk of bringing the other forum into this, how about pro triathletes with kids. Should they stop? It's risky - 3 threads just this week, one about an age grouper triathlete killed on the bike before going to Kona, one of a swim deaths at a 70.3, and another about Kat Matthews being taken out by a car in a crash that could have had much worse consequences. Then Rappstar, Tim Don, etc etc all being hit by cars / trucks that could have killed them. For what ? A poorly paid job of swimming, riding a bike and them running a long way on the trot.
It's not like they are firefighters or rescue workers doing some greater good for society. Should tri be limited to single people with no dependents only.
I think most people would say they aren't the same (or at least don't feel to be the same) because the risk from cycling is largely about someone making a mistake and therefore doesn't really seem inherent to the activity, whereas with "extreme" athletes they are often enough engaging in something where it's "extreme" precisely because the risk is so high, maybe the cycling equivalent would be something like descending a mountain while dodging in and out of traffic.
Now whether this perception is accurate or not is a different question. We'd need some sort of data on serious injuries/mortality per hour to determine that.