

TOS had the “Eugenics Wars” / WW III start in the 1990’s, but the later series made alterations to the original timeline due to several time travel shenannigans. An easy way for the writers to explain why we aren’t currently living in a post-apocalyptic hell. All the major events will happen, just delayed accordingly.
Star Trek is supposed to happen in our future, so it’s hard to address our modern problems if they had to skip everything that happened after mid 90’s. Especially when the last 25 years have had a lot of mental stuff happening almost non-stop.

You are correct. It’s scary how things like these used to be just dystopic fiction. Now it is a completely plausible scenario in the very near future.