Tint does not change the way the glass shatters, it simply holds the shattered glass together and from flying toward the occupant. Somehow that is still thought of as dangerous. It's only safe to use on the back door windows, because the back seat is where we're told to put our children for safety reasons.
Tint on the front side window prevents other drivers from seeing that you have seen them. This is especially important at intersections. Even if your tint is light enough for you to be seen by other drivers, this too is still thought of as dangerous. I can't tell you how many times the sun alone reflecting from bare glass makes the driver hard to see.
Bottom line: The political reasons for prohibiting front side tint trump the health, safety and comfort benifits of having UV and heat blocking tint applied to your windows. You and the doctors who recommend it are wrong, the government and police who outlaw it are right. Do it and risk prosecution to the fullest extent of the law.