Yes you are possibly right about the disclosure thing, although if its ever tested in court it will probably get knocked on the head. In any event the problem only occurs when the disloure is form is issued at whatever interval that is. So you only have to worry about it when its re checked. However as I said a Police officer could lose his job for speeding in his own car on a day off...Could you?
However thats not the whole point. Even if you do get convicted of an offence and an airlines sacks you, you can still work for a non UK airline, or a flying club. In other words you don't lose your livelyhood if you lose your job. A Doctor would, so would a Police Officer, and so would many other professions.
The original point was a desire to have the same rules apply to all professions, a good idea, I agree. However you have to understand that if you want the rules to apply equaly then that means equaly and you have to face the possibility that rules and restrictions on those other professions are possibly not ones you would welcome.