I'm not sure that anything should be done about it, at least if we look at it from whole society's perspective. (Or rather, we should try to avoid the echo chamber effect if possible, but not at the cost of reducing dispassionate discussion.) If some places discuss sensitive issues dispassionately, then those places risk becoming echo chambers; but if no place does so, then there won't be any place for dispassionate discussion of those issues. I have a hard time believing that a policy that led to some issue only being discussed in emotionally charged terms would be a net good for society.