I live in AZ, why does Gilbert and Scottsdale give you the left arrow AFTER the red?

It is to cut down on red light runners.

It's supposed to be be "safer" than the turn arrow before the green because people aren't trying to run the light. But I think it messes people up more because it's not the same over the whole valley and when you cross from Phoenix to Scottsdale and hit the difference, it just screws people up making it more likely to cause an accident.

I like the lagging left turn arrows because you can turn left if it's clear (before your left arrow) but if you don't have a chance you still get an arrow at the end of the light cycle.