literally by the availability of "instant, as it's happening" technology - radio, TV, internet. It ends up allowing a "mass experience" of both good and bad events, literally in "real time".
A perfect "historical" example of what "lack of immediacy" resulted in is the very origin of "Juneteenth", where the Emancipation Proclamation was signed in 1863 and the people in Galveston, TX didn't "get the memo" until 2 years later.
I think this requires people to try to cope or tune out in some way, and many do (which when it comes to things like the encroachment of fascism, is what they want to happen - less "engagement" and thus they power on). All of these types of systems eventually fall - but agree that the wait is horrible, especially if you or your family/friends/neighbors are directly impacted.
But people who experienced it do pass that info on to the next generation. I have posted this before, but (as a Trek reference too 
), George Takei had a recent interview to describe his time in several internment camps during WW2 -
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