The purpose of voting is not to enact a society's best interests. It's to give the people representation of their desires. If you judge things that way, then by right, few conservatives would have the right to vote.
I've had the misfortune to know a heroin dealer (and junkie). He watched a lot of Fox News and was convinced that if Obama was elected whites would be put into concentration camps. That sounds SO MUCH like me, don't it?