The world is so complex that no one can have real-world experience in more than a fraction of it. There's too much to know.

The best legislator would be an intelligent, open-minded, intellectually curious person who listened to and followed the advice of experts. They could address the variety of issues facing lawmakers without becoming stuck in the "knows just enough to not recognize their ignorance" trap.

From your list of examples it's pretty clear where you're coming from, but do a bot of critical thinking:

What about the border troubles you? That some people naively believe that overly rapid immigration isn't bad for the country? Or those who think that cruelty and violence are the answer? Meanwhile, the number of refugees and other displaced persons will increase due to growing wealth inequality and the effects of climate change.

The only way to have a secure border is to create conditions where people don't want to come, but it's the anti-immigrant crowd who are most responsible for stoking the root causes of immigration.

On a similar note, increasing wildfires are a fact of life in a warming climate. But it's the pro-business, "common sense" politicians who've stood in the way of addressing it.

P.S. There's no such thing as common sense. As mentioned, the world is complex, and there are so many variables that supposed common sense breaks down. The obvious answers are usually the wrong ones. Critical thinking is the key, not the simplistic, limited thinking of "common sense."