@n3verm0re’s response really nicely covers what I wanted to say in response to this. It’s a huge challenge to provide the kind of space you’re asking for, on top of the existing huge challenge of forming and maintaining a community in the first place.
To be honest as well the “Well I’m not going to change my views if nobody will debate with me on them” line has been the concern troll party line for decades. It sounds very reasonable and rational to say that we should be open-minded and consider an argument for its merits rather than ignoring it entirely. But it’s often in the same breath as “But you shouldn’t be able to vote” and it’s a nasty trick, isn’t it?
FWIW I’ve spent a chunk of time in discourse with people like these and I’ve had a million times more luck in 1:1 conversation than I have had with public forum arguments. These kinds of debate are important but I really doubt it will ever be important that we have them publicly online. There’s a few charity organisations now which hire people to go online and engage with people one-one-one about these topics and they’re a much better idea than taking a public space, accessible both to those who can and want to debate rationally and those who can’t/don’t want to, and trying to have it out there amid the chaos.