In reply to Dr.S at work:
There was a paper in Science a few years back sort of along these lines, which makes for interesting reading. Basically, the premise is that as events start to become less frequent, people broaden their definitions so they perceive these events to keep happening.
"As it turns out, abstract concepts can creep, too. For example, in 1960, Webster’s dictionary defined “aggression” as “an unprovoked attack or invasion,” but today that concept can include behaviors such as making insufficient eye contact or asking people where they are from. Many other concepts, such as abuse, bullying, mental disorder, trauma, addiction, and prejudice, have expanded of late as well. Some take these expansions as signs of political correctness and others as signs of social awakening. We take no position on whether these expansions are good or bad. Rather, we seek to understand what makes them happen. Why do concepts creep?"
https://science.sciencemag.org/content/360/6396/1465