do you believe that LW is capable of creating that first thread?

I belive most LWers are capable of this. However those who aren't make this in my opinion very difficult for the community to pull off. And then there are the signalling concerns, one big reason behind the politics taboo was for LW to not look bad. This is why I previously proposed tabooing the subject (romance ect.) in the same way we did for that other problematic topic. I also found someone's proposal to set up a rather elitist and private mailing list for certain delicate and difficult discussion appealing.

Or only that, if it did so, that would help?

If LW did that we might actually make some progress on the issue for a change in that we would at least unambiguously establish what people's maps of reality are (allowing everyone involved to update accordingly) and engage in a, you know, dialogue instead of speaking past each other and slipping into factionalism.