Safety is important for all, Tony. Tinted windows can greatly reduce sun glare inside the passenger cabin, making it much safer for the driver. I, for one, suffer from a condition which makes me very sensitive to bright lights. All of my cars have tinted windows. Of course, it's legal here.
The only time an officer needs to worry about windows being tinted to darkly is when dealing with a potential criminal or a known criminal at a stop or orherwise. Since that person is already a criminal, they're not gonna follow the law about tinting, so tinting laws are pretty useless as they only affect law abiding citizens.
A good comparison may be some folks take on gun laws. You can outlaw guns, but that will only affect law abiding citizens as criminals will still be able to get them (not necessarily my stance, just an example).
Or maybe a female victim of a violent crime would feel safer if men never went out in public. Outlaw the Internet since some use it for criminal activities. The line has be drawn somewhere. I'm not implying that window tint is all that important to safety or one's personal rights, but it's a slippery slope.
That's just my take on it. I do come from a LEO family, so understand both sides, just don't necessarily agree fully.