The analogy was not about new vs old customers being allowed to have guns.

I think that's a limitation of the analogy because there is no correspondence with trusted computing. I guess it would be some sort of a magical gun that some other company is endorsing as of limited use during bank robberies? Maybe like some sort of RFID thing that disables the gun when inside a bank?

Anyway it really stretches the analogy to get tied up in technical details (risks missing the forest for the trees type error).