The surgeon has incentive to perform surgery whether it is the best decision or not

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The doctor who refrains from operating on a back (a very expensive surgery), instead of giving it a chance to heal itself, will not be rewarded and judged as favorably as the doctor who makes the surgery look indispensable, then brings relief to the patient while exposing him to operating risks, while accruing great financial rewards to himself.
-Nassim taleb, Antifragile

This idea applies to politics as well. The politician that does nothing or says "let's wait and see" or says, "Let's cut back and become fiscally responsible" or says "let's not keep printing money so we can FIX our economy and broken fiat dollar" and so on, will not be elected.

The politician that doesn't make big promises that appeal to citizen's biases and prejudices does not get enough attention to get funded by the big money donors that bring them into the political gain.

There is a concept known as Iatrogenics, which is when a treatment causes more harm than benefit. As iatros means healer in Greek, the word means "caused by the healer" or "brought by the healer." (source

This concept applies to all systems in which humans intervene. And if you look to history, from science to technology to farming to governments, you see that most things we do have unintended (or intended) side effects.

The human mind is not good at letting nature take her course. The human mind has ego and hubris, and falls traps to the many biases that create blind spots. Conclusion: there is bias in science in medicine in government in human relationships in education in launching rockets into space (Nasa), in everything.

One thing is for sure: Nature knows best. And every time we try to thwart nature or bend her to our will, we create problems. And we often make it worse than if we simply did nothing.