As a person ages, their "night vision" diminishes. At 55, I'd have to say mine isn't what it used to be. I like the look of tinted windows from the outside though.
But if I was a police officer, I wouldn't relish the thought of walking up to unopened "tinted" window.
Besides, our cars are hard enough to see out of now. Why make it even harder, just for the sake of fashion.