"Both sides" is often two wrong sides. The world is not binary. Those who only listen to both sides might never notice that.

The point of listening to "wrong" sides of an issue is to see how well your "right" side stands up to scrutiny.

The history of science is full of obviously right things that turned out be be wrong.

Even Einstein, who upended Newtonian Mechanics, rejected Quantum Mechanics, since "God doesn't play dice with the universe".