What do we have wrong?

I'm skipping ahead on the list today. So many seemed so "meh" to me and this one really stood out.
"What popular notion do you think the world has most wrong?"

That's easy: That someone is always right.

For SO many countless issues, there is no right or wrong answer. Or right side in a fight. No one has all the information. People's backgrounds, experiences, and personalities influence their decisions and viewpoints. Take, for example, gun control. Person A survived a mass shooting. He is an advocate for stricter gun laws. Person B had his life saved by a "good guy" with a gun who stopped Person B's assaulter. He is an advocate for everyone owning guns. Both have strong, valid viewpoints and both think theirs is the correct answer.

Basically every issue in every debate is the same. Also for wars. Each country involved believes firmly they are fighting on the correct side. No one goes to war believing that they're wrong.

So what IS the answer? There is no easy solution. People are so firmly entrenched in their beliefs that most refuse to even consider the other side. Until that happens, I fear we are doomed to a society of hatred and conflict.