The San Francisco Board of Supervisors are considering a rule that would prohibit the use of SFPD to enforce policy decisions on the part of any airline. IOW, if you choose to deplane a passenger under overbooking circumstances, you get to do it...and you get to absorb the full liability of your decision.
Sounds fair if the airline created the situation. Sort out your own mess.
The airlines create this situation, try limited steps to resolve it, and then resort to threatening pax with LEO if s/he don't cooperate. This threat does usually sort out the problem, but if the threat doesn't work then LEO get caught in the mess.
You break it, you own it. Next time you might be more careful not to break it.