Some people have this weird notion that as long as COVID only attacks "unhealthy" people, it's no big deal. Anytime we hear about someone who gets super sick or dies, it has to be explained away with, "well, he wasn't really a runner," or "he was overweight," etc. Part of it seems to come from a certain moral superiority that fit, active people have. Sort of like, as long as the people who are suffering are people who didn't take care of themselves, then we shouldn't feel that bad. It's almost reminiscent of the historic view of AIDS as not a big deal because it affected mostly promiscuous gays and drug addicts.
But even setting that issue aside, huge numbers of people have risk factors that are entirely outside of their control. For instance, David has had asthma his entire life. For what it's worth, though, I never knew he had asthma. He always seemed like a perfectly healthy, young adult to me. (I guess 44 isn't that young anymore; it sure sneaks up on you.) There are a lot of people out there who don't seem all that vulnerable but who nevertheless get hit very hard by this disease. I have never had peers hospitalized for the flu before, but I've had several peers, including David, who were on death's door because of COVID.
On the other hand, I do think much of the media is on a somewhat dishonest crusade to frighten young people by hammering us with anecdotes about how the disease spares nobody, even though statistically, we're relatively safe. For instance, NYT had a headline the other day about DeSantis "falsely" claiming that no children had died from COVID. (The actual statement was something like "I think no children have died," where the actual number was something like 3 kids nationwide out of 20k deaths or so. His point was basically correct, and he hedged, but he still got slammed. This is counterproductive. You don't correct misconceptions by exaggerating in the opposite direction. If someone disagrees with you, and you point out 19 ways in which they're objectively wrong, they won't pay any attention to your entire message if it turns out that the 20th thing you say stretches the truth.
So, yeah, COVID can hit anyone. You're not invincible because you're a young runner. And we don't understand why it hits some people hard and not others. So it makes sense for everyone to be careful. But it's also true that non-vulnerable populations don't have much rational reason to fear for their personal safety.