Do you have any sources to back up a reduced tolerance for viewpoint diversity, or is it just that their Overton window has shifted away from yours?
e.g. would they tolerate (even if they didn't fully agree with it) things on the extreme but opposite end of various political axis from you that you would consider beyond the pale, and vice versa?
From your perspective what seems like a narrowing of viewpoint diversity could seem like a blossoming to someone diametrically opposed to you, because each sees the subtler distinctions between factions in their own comfort zone.