@whitequark I dunno if this is bait but here goes (bcs who knows?)
IMO, sarcasm is a mechanic to grow over the sad depressing feeling, that the expression of facts/opinions build up in the first place.
It's a coping mechanism while metaphorically painting a black picture in the hope to find lighter speckles that can be enlarged. Or at least to find a time spot of solace.
Sadly this PoV can also be attached to pictures that aren't fully black but to every image and that might pose a problem in itself