The reason you have to worry about career politicians is precisely because the average voter (and non-voter) is braindead. Having them in office would be disastrous beyond belief.
Look at the uproar generated at the proposal for the slightest reduction in government and the inability of devoted ax-wielders like Ronaldus Magnus to change it much.
Reducing government size and power is not a priority with the vast majority of voters (or non-voters either, apparently.)