Not sure it has a specific name, though it’s pretty much idealism. To add another pithy phrase for us in this conversation, politics is the art of the possible. In democratic systems, it’s pretty rare for any one’s ideal to be realized. With people who disagree on fundamental values, it’s more likely that politicians will need to compromise and work on a consensus for policy. It makes for messy solutions that are rarely ideal. At the same time, it’s less likely to lead to any one group being able to dictate policy and create authoritarian dystopias.