You seem to be overlooking the fact that all those positions are positions of "public trust." Granted there may be cases that are abuse of the priveledge but I can say that it has not resulted in any events worthy of revoking the policy. As a society we have to be able to grant trust to some positions, and there are individuals that are not able to uphold the trust that is placed on them. This is true of any position whether it is a mechanic or an FBI agent. Can you rely on anyone or everyone to "do the right thing 100% of the time? No. IT is totally subjective and therefore subject to the whims of the person setting the standards.