It is possible, and rational, to be skeptical and trust others simultaneously. Life is more fun if you do not believe everyone is out to get you, and that there are shades of gray.
People are out for themselves. And if someone is in your way, and takes some hit because you have the Chevy Suburban and they're on a Honda SuperCub, so be it. It's not that you hate their beautiful red and beige paintjob, it's that they were in the wrong lane at the wrong time when you decided to overtake whoever was in front of you. Colloquial pronouns, of course.
This is also an assumption that is a luxury due to me living and growing up in a stable and prosperous country, and I can certainly see different circumstances producing different mindsets.
But I also think there is plenty of good being done by organizations (at least the ones I’m familiar with in the US) to justify giving them some benefit of the doubt.