I wear seat belts in all vehicles equipped with them. That includes aircraft both my own, other private birds and commercial. I don't ride public transportation so it's not an issue. The very few times I did ride a taxi, such as in Vegas, I did wear the belt.
I have driven a patrol car into many situations where violence was already being provided or was extremely likely. I never had a problem getting out of the belt and out of the car in plenty of time in real situations, not hypothetical ones.
I wear a helmet. I don't need a law to tell me to do so. I know my head is worth the price of a helmet and I've seen the results of having one and not having one in a motorcycle collision. I have never, let me state that again, never seen anyone who's neck was broken in a motorcycle related collision by a helmet and I've personally been to more than a couple collision scenes. Nor do I personally know anyone who has personally seen that "phenomenon". In my section since we did the majority of collision investigations. Motorcycle collisions were pretty much interesting to us since we rode them for work. We got information regarding Officer fatalities as part of in service training even if it happened in another state. We often shared information about the more memorable collisions we investigated and especially the fatal ones and I have never heard of anyone in the traffic section finding that particular circumstance. That kind of ranks right up there with the old "wives tale" that you should never use the front brake on a motorcycle because it will toss you over the bike if you do.
Frankly if the collision is that bad that a neck is broken there are likely to be other trauma's that would make a broken neck a moot point. One of the worst collisions regarding motorcycles I know of was the guy who I replaced in the motor section at work. He had a total body crunch from being side swiped and pushed into oncoming traffic by a car that hit him twice. He had a head on with a combined speed in excess of 60 MPH. There were bruise imprints on the brain from the helmet straps when they did the autopsy. His neck wasn't broken but most everything else was and he would have died anyhow from the ripped aorta even if there was no other injury to the brain.
I don't tell anyone over the age of 18 that they need to wear a helmet. I won't tell them that their head is worth the price of one if they think it isn't. They ought to know more than I would about it's value.
My masculinity is not threatened by the use of a helmet or seatbelt. I ride wearing what I want and don't care a bit what anyone else thinks about it. If they can't deal with it I have no problem at all riding alone. I ride for my own personal satisfaction and purposes, not to impress anyone else. I don't ride a bike to make me what I am, I ride a bike because I am the person I am. The bike does not define me, it's just a tool.