It's an ideas bank. We all have some good ideas about how to make the world a better place. Often the people who have them aren't the people in a position to do something with them. ShouldExist provides a place for them to be archived and searched by others. It's a community of original thinkers brainstorming about our future.
It's a tool, a system, an infrastructure (though not a highly recognized one). It is morally, ethically, politically neutral, vacant even.
See also OnlineInnovationRepository.