That is because the result doesn't matter, not in "starve the beast" [1] cycle politics - it used to be mostly about money but the model can be used also for general politics. The playbook is:
1. side A rise to power claiming "issue X must be solved by doing Y" (all while knowing that doing Y is useless or counterproductive, but the voter base doesn't care - be it immigration or the defunding of healthcare or whatever)
2. The consequences hit delayed, when the term is at its end and the competitor B takes over (usually in US political cycles every 8 years, but these days it seems like the ping-pong is accelerating)
3. That leaves an opportunity for side A to constantly barge in from the side "look at issue X, vote for us next time and we'll fix it (for realsies this time!)"
4. Side A wins the next election.
When it comes to anything budget related, replace the campaigning slogan with "look at issue X, it is clear that the government is incapable of doing anything about that issue, let us privatise it".