Your question makes me realize there's some ambiguity regarding "believing" in a company.

There have been teams, especially small ones, where I trusted everyone on the team to act like a true friend, and to strive to do good things for the company.

I don't recall ever working for an organization where I 100% cared about their goals, or believed 100% in the righteousness of their goals, or where I was 100% sure they'd succeed.

Agreed. It's never 100%. Life is more complex and nuanced than that. Nobody - the other people or myself - is 100% caring, righteous, etc. Real, adult ove is caring for, believing in, and sometimes committing to the flawed creatures, even as we're flawed ourselves.