I think its one of the reasons reddit will never reach the mainstream like reddit. For one people find it confusing to find a community which I disagree with, you just need to take a slight effort to understand that you have a choice of community and in return you get great freedom. Since its mostly for more techies I and its overwhelmingly like left, people with moderate right views will feel like they're completely out of place.
Im also sad that many of the bigger communities like ml have unhinged mods that ban for anyone disagreeing with them. For example some calls for violence being overwhelmingly onesided on here made me feel sick at times. But I don't feel like sparking that debate over here.