While I understand your sentiment, by your logic no one serving in the armed forces would be allowed to vote either, or anyone working in the defense industry, etc etc etc.
I said that military personnel would be exempted from the ban but government union thugs would not. and why would we want anyone who has a vested interest and able to vote themselves largess in letting them do so? If a teacher in a government school wants to vote they should teach in a private school. If a bureaucrat wants to vote they should get a job picking peaches or changing tires or something else that would be useful and not destructive.
It's the only way I can see of solving the problem of the "professional voter"