The government being able to fire an MP from being a minister in the government is a strong deterrent against this minister from voting against the coalition.

The government being able to fire an MP from being a minister in the government is a strong deterrent against this minister from voting against the coalition. The coalition and the government are one, in effect, mainly due to coalition discipline. A good example of that is the recent vote for elimination of Reasonability, where all of the members of the coalition voted for it. Do you honestly believe there's no one person in the coalition who opposed it?