They shorten the duration of the yellow light below DOT regulation. There is only 2 things you can do, lock up your brakes and end up in the intersection and receive a ticket, or floor it and receive a ticket.
If you pay, no points.
If you take it to court and lose, you get points on your license.
That's how it is in Florida at least, and if your front wheels are over the white line prior to turning red, you are fine.