I'm fiercely against do-gooder nannyism - for things that should be a personal choice. Crash-helmets, seatbelts, drinking, smoking, drugs even - I disagree hugely with legal punishments, punative taxes or prohibition.
Litter affects everyone, utilizing a tax/charge technique shown to cause improvement, without major disruption or hardship to people, I'm all in favour.
I agree with your point ONLY if people injured whilst not wearing helmets/seatbelts are not treated on the NHS. Otherwise it does impact on others.