What do you need to communicate with other driver for? Hand signals are visible, light signals are visible, roll your window down.
Chances are, he is on his phone as many drivers are...doesn't make it any more dangerous just because YOU can't see it.
If you're in the tinted car, why do you have to worry about someone crossing the street? You can see them regardless if they can see you or not. You're the one in control.
You're the cop, pull the gun on the driver, use your loudspeaker to have them open the windows, abuse your power like so many others do. (It's funny that police cars can have limo tint but citizen cars cannot)
Tinting does indeed reduce internal temperatures if you install ceramic tint. This happens by transmitting less, reflecting more, and absorbing more solar heat. The darker the tint the greater the effect. Look at the numbers, do an experiment yourself, it's proven.
Last but not least, it is about privacy, protecting your cars interior, and not letting guys like you see us when you dead stare into our cars for the duration of your turn...take a picture it will last longer.