Right, there’s no question that the JFK assassination was much more significant, in global terms, than the OJ case. The killing of a president, vs. the killing of 2 people virtually no one had ever heard of; the question of what this would mean for the US government, vs. the question of what this would mean for a football-player-turned-actor; the significance of a person daring to shoot at a president, vs. the sadly-every-day incidence of a husband apparently killing his wife…there’s no comparison.
But I was three years old when Kennedy was killed, and I don’t remember it at all. And while I get the significance of the event intellectually I didn’t experience it myself. And the fact is that the government didn’t fall apart, and it’s not clear that policies changed all that much as a result of the killing (Johnson was certainly much more aggressive on civil rights than Kennedy had been, and much more aggressive of Vietnam as well, but it’s not at all clear that LBJ’s actions on either were significantly different from what Kennedy’s would’ve been). And the culprit was found, and there was no conspiracy (I know, I know), and no president has been killed since (not that people haven’t tried, hello, Squeaky Fromme).
So when I look at it from my vantage point, I see “not as big a deal as it might have been,” whereas for those who lived through it, it must have been very different. I just can’t access that easily.
Anyway, I’d argue that King’s death might have been more significant than Kennedy’s, but that may simply be that I do dimply remember MLK and his death. And I would absolutely argue that Watergate was THE most significant event of this type of my lifetime–at least until 9/11, and now Trump might be in the mix, we’ll see–but again, I remember Watergate very well; my wife and I both call it our formative political experience.
As for Simpson–I followed the case, it would have been difficult not to, and while there was on the surface not a lot there other than celebrity, it was remarkable theater, and as others have mentioned it was an interesting litmus test. As important as the JFK assassination? Not even close. But I lived through the one and not the other, and I get where the OP is coming from.