It's definitely a weakness. There is an entire spectrum of personal beliefs, but wherever you are, if yours don't align with the mods you get censored. Reality is every new users first week is finding out where they 'belong' and this both discourages new users, and creates detrimental echo chambers.
If your "personal beliefs" entail persecuting others for their ethnic origin, sexual orientation or gender identity, you can fuck right off. Otherwise you won't have any trouble fitting in here.
In my experience, there's only been a handful of mods and an equally small number of instances where I feel that is likely to happen, but for the most part it seems most mods have a pretty light touch. I've only had one negative experience with a mod, personally, and I post quite a bit.