...seriously, why would you want to own/wear a bulletproof vest? If the "because I can" reasoning comes up again, it's just getting weaker and weaker. I once bought a vest, because it was exceedingly cheap, and I wanted the kevlar for making composites for another hobby. Never ended up pulling it apart, and flipped it, wondering why anyone would want one.
hmm how about BECAUSE I FKING WANT ONE.
do we really need a reason? absolutely not. it's just like asking why would you want to conceal carry?
they are both for protection, one offensive the other defensive