I think you may have a recency bias towards the mitigation techniques. The reason it seems like there's no hysteria around cars is because we've already gone through that phase and implemented the best safeguards we could come up with: the right analogy here is to see what a stickler our society is for having car insurance, which is the closest thing to a "car accident vaccine" we could come up with. Given the reality of the frequency of car accidents, and how they can potentially affect others just as much as yourself, we've implemented a system where it is a requirement to have a way to compensate the other person if an accident happens (not to mention the various laws we have around driving, the big deal that was Mothers Against Drunk Driving, breathalyzer checkpoints which could be seen quite analogously to covid testing, the fact that we need a license to drive and are tested for driving proficiency, the penalties for driving unsafely, laws requiring you to buckle your safety belt, laws around safety belts and airbags needing to be included in cars, etc. etc.). If we had an actual hypothetical "car accident vaccine," we'd probably just require you to have that instead of this tremendously complicated and expensive infrastructure around driving.
So I'd argue that what we actually don't see is heightened emotion around this onerous car infrastructure, to the point where you are essentially presenting cars as some sort of model for c'est-la-vie attitudes both from the general population and the government, which couldn't be farther from the truth. The reality is you've just gotten used to the burdens we've taken on to make our activities livable with respect to cars. Go watch the "Not Just Bikes" YouTube channel and you'll see just how much of your life is actually completely governed around accommodating cars (and a big part of that is in making their presence safer).
> the “hospitals filling up” narrative is mediopolitically-motivated justification, not grounded in deductive reasoning nor meant to drive effective mitigative policy.
Source?