Be careful SCM! Those very passengers will sue you for letting them ride without a belt in the event of a crash. I have seen it happen so many times.Besides their projectile bodies could put you or other passengers in danger.I'm the complete opposite. My kids have to wear their seatbealts - as do other minors who ride with me - but adults are on their own when it comes to that.
I think Nick looks like a bozo in all of this, but I don't think for one second that it was Nick's responsibility that John wear a seatbelt.