What you deserve and what you are at fault for are not the same thing. Fault is a legal concept - as you said, by definition - of who is responsible for the outcome. But that doesn't mean that breaking the law means you deserve broken bones and misery: things you deserve are things you should be rewarded with or punished by for an action. If you deserved it, the punishment for illegal lane splitting (or an equivalent crime, like speeding) would be for the police to take a baton to your knees.

After jumping to blaming the rider, you graciously accepted you were wrong about the law in some jurisdictions. Unfortunately, you then continued trying to blame the rider without taking the lesson that you may not be aware of what's safest for a bike rider to do. The only explanation I see for this is that you place people on bikes in a different mental tribe to your own.