Thats a bunch of BS
I would call Midas Corporate offices and get something going.
Regardless of the air in your system, after you do a brake job, you must test drive the vehicle to verify proper operation. If Midas was smart, and found that there was a problem, like air in the system, they have a responsibility to notify the customer of a potential problem. They could have made money on you and kept you a satisfied customer. Anyone that works in a professional shop knows that brakes are very important, especially for SAFETY. If you went driving off and crashed into someone, and they were the last ones to touch your car, they would be screwed.
Don't let a run in with the cops in a very unique situation (father, son BS) let that Midas store and the local PD screw you like that for something they ARE responsible for. If it comes down to it, I would even possibly go as far as to notify local News Papers about it, if word gets out that they do half-assed work and then don't deal with their customers, that Midas store will go under...