The problem is that a radio, once programmed with the ASK, can't be DEPROGRAMMED without it. And that creates its own suite of security risks, because MOST radios that are retired from service are NEVER deprogrammed before they end up in the box of electronic surplus that gets sold at public auction. If that radio is still functional, or made to be functional, and nobody bothered to inhibit it, then it's a live radio on a live system if it's still in range. Do you fail to see that problem?
Additionally, if the radio is of a type that still has significant aftermarket value, that value is destroyed by the fact that it's locked and can't be programmed. It can't even be DEprogrammed without the matching ASK in the programming loop.
It would NOT have killed Motorola to make allowances that permit a programmer to DELETE all trunked personalities without an ASK. In fact, set it up so that the only thing you can do to an ASK radio is delete the associated, ASK protected trunking personalities, or leave its contents exactly as they are, no changes.
To have radios locked down that are no longer even owned by the department that they were set up for originally is nothing short of monumental stupidity, the kind of which is rarely seen outside of a Presidential election in the USA!
Yes, there are ways to deprogram an ASK enabled radio. But we don't speak of them here.