Has anyone asked the TSA why PreCheck cannot be applied for flights TO the US on participating carriers?

If one pays for PreCheck (or Global Entry), is there any rational reason why it cannot be applied to inbound international flights? I didn't think so.

My theories:

1. There are too many PreCheck/Global Entry members, so the airlines wouldn't be able to meet the required percentage of selectees.

2. PreCheck would effectively eliminate the need for "20 questions" before check in and "3 questions" before boarding, and the random or non-random gate screenings for all of the PreCheck/GE passengers.

This would be a good use of resources, allows the airlines to concentrate security efforts in a stratified fashion, and take advantage of the fact that PreCheck and GE passengers have already been vetted. No need to repeat the vetting process each time the passenger flies.

My guess is that their argument would be "increased threat" at overseas airports, but--errmmm--September 11th? It's not a valid argument.

Why am I even asking? The TSA hasn't been introduced to the concepts of logic and efficiency.