> WHy is it your job, or any one else's, to tell someone what they should do for their own good?
The line isn't quiet as arbitrary as you make it sound. Itd be a different story if your health insurance wouldn't have to pay if you didn't wear it etc. There is also the extra inconvenience of having the road blocked for extended periods of time whenever someone offs themselves etc.
Pretty much every personal safety regulation happens because other people are getting impacted/inconvenienced in some way