The only possible argument against is..
‘I don’t want to.. I DON’T LIKE IT! WAAAAHHH’
No, the argument is at what point do you stop?
Helmets are a good idea – make them compulsory. Hi-viz is a good idea – make it compulsory. Using a car instead is a good idea – make it compulsory.
There’s a big (huge, massive) difference between saying that a certain safety feature is advisable, and making it a legal requirement. If we made every possible safety feature a legal requirement, we’d never be able to get out of bed.
Oh, and contrary to your “Waaah” baby-like argument, it’s the pro-compulsion people who treat grown adults like children, unable to look after themselves.