I would say it’s probably the philosophy of the fediverse that limits them. There is a spectrum of opinions on every subject, including strong opinions and dangerous ones, sometimes both at the same time.
Having a safe space requires either control or exclusivity in my opinion. The fediverse affords you little control of instances outside your own besides outright defederation and banning of external users. Though arguably that lack of external control is one of the benefits of the fediverse as well. However, if their goal is a safe place for those they feel are disenfranchised and marginalized, they might be right that this isn’t the tool for the job. Though, adopting a different platform or strategy might limit their reach. I think that is their dilemma.
Aside from beehaw… The lack of a central control structure within the fediverse is fascinating to me. It’s reminiscent of the old internet, where everything was ran as its own little web island, and yet it has many of the benefits of the mainstream “mass market” internet of today. Over time, it will be an interesting experiment to study and be a part of.