An ethical question, if the opposition does not approve of the governments actions, but voting against the government causes more harm to the nation, what should the opposition do?
For example, the latest lockdown. Labour said it should have happened earlier and that would have made it shorter. The government disagreed. But then a month later they proposed a lockdown. Labour wanted to vote for a shorter lockdown a month prior so don't support the government's action. How can you support failure? But for the good of the nation, you have to vote for the late and longer lockdown, despite not wanting this or wanting to back a poor decision.
Similar rings true for Brexit. What do you do when it comes to voting for the EU-UK trade deal? If the reality is a hit to UK GDP and it does not appear to be in the nation's interests, do you vote for it anyway because a no-deal is even worse?
Regardless of the particular examples, it's an interesting political philosophy question.