It’s still unknown if someone engaging in risk will end up in costly collisions, or other events. Just because you engage in risk doesn’t mean it will bite you, only that it is more likely to bite you.
Besides why should less risky drivers subsidize riskier drivers?
If they have an ACTUAL measure of lower skilled and higher risk drivers, fine.
But when they use overly simplistic data (or use it in an oversimplified way) that makes the highest-skilled drivers appear in the same batch as low-skilled and high-risk drivers, that is not subsidy, it is unfair penalization by stupidity.
"Besides why should less risky drivers subsidize riskier drivers?"
They essentially do. If the safe drivers are never at fault, those premiums went somewhere. If the risky, repeat accident drivers aren't paying thr full price replacement vehicles, that money came from somewhere.
If it is insuring known or likely risks, then it becomes a subsidy or wealth transfer (which should be the domain of governments).