Healthy systems need internal self-correcting mechanisms.

One frame: devil's advocate.

They try to push back on the weakest part of the argument, to tear it down; if the overall thing fails they succeed.

A better frame: "loyal opposition."

They push back but want the thing to be successful.

When we receive that disconfirming evidence, we have to trust the intentions of the bearer to be loyal.

If we don't we interpret it like the devil's advocate–easier to discard.

In general, be very careful to make sure you always seek other loyal opposition to your ideas, lest you get stuck in an echo chamber.