"The politicians should be accountable for these things, or they should say in advance 'we try this for a month and if it doesn't work or is inefficient we stop it'."

I think this goes back to how politicians are deathly afraid of ever, anywhere, being wrong. This seems to even preclude improving/changing their own positions on most things.

There is nothing wrong with realizing you were wrong and changing your opinion, rather there is something wrong with hanging onto a belief or opinion when the pile of evidence is not only against you but continues to grow.