I always wear it. I saw way too many gruesome deaths studying safety, and not wearing it's a really stupid reason to risk one's life. My family doesn't though, and I always have to ask them to, which is fucking tiring, not to mention they often just ignore me. My sister said God would protect her anyway so why wear it.
I still ask most people though, since I don't want to feel guilty in case something horrible happens nor do I want to be hit by their dumbass bodies in case it does.