I somewhat grew up with conspiracy theories, as they seemed more widely accepted through my teens and college years, although after Oliver Stone's movie JFK was released, I began to notice more of a backlash against that and other conspiracy theories.
I think the JFK Assassination is something like the "Mother of all conspiracy theories," but a lot of people really did take it seriously. But then there was Vietnam, the Pentagon Papers, other revelations about the US government that showed a somewhat "darker side." Then the Watergate scandal broke. Some of the mischief of the CIA and FBI also came to light, which changed people's perceptions of our government.
At least in terms of what our government did during the Cold War, I think much of it may have been a reflection of what was already evident in society. There was a strong sense of U.S. patriotism along with anti-communism all across society, along with immense fears about potential threats to America and our way of life. This is what seems to underlie much of the nefarious activity engaged in by various government agencies, particularly the NSA, CIA, FBI, and the various organs within the military. They didn't really need to "conspire" with each other, as most of them had fervent belief in the cause they were fighting for.
Nowadays, communism is not considered the same threat as it once was, so anti-communism has gone to the back burner. But the idea of America being the "leader of the free world" and the apparent inescapable responsibility to be the world's police force and arsenal of democracy continues to be the prevailing stance of our political leadership and large segments of the US population. But over the past decades, there's been more cynicism and openly challenging of these kinds of ideas, yet they still seem to have a great deal of staying power over the masses.
One beef that I do have with most conspiracy theorists is that they often get bogged down in a lot of details and pieces of evidence, as if they're trying to build a legal case about something. Yet they seem to miss the point that this is ultimately a battle of ideas and competing philosophies. There are those who believe that America should continue to be militaristic, interventionist power, and there are those who believe that we might consider toning it down a bit.
As to where all these competing ideas come from and why some segments of the population believe one or the other, that's a fascinating topic in and of itself.
Another thing to consider, at least about some conspiracy theories, is that even if a given conspiracy theory is true, would it really change anything?
A famous conspiracy theory is the Moon Landing Hoax. Let's say someone really did come up with irrefutable proof that there really was a Moon Landing Hoax. Would it matter? Would anyone care? Oh, there might be a fuss about it, but it wouldn't be enough to trigger rioting in the streets or revolution.
I think I have received a very, very secular education.
My teachers and my professors have always taught me that logic and reasoning simplify our lives.
Cognitive bias, dogmas, preconceptions burden our lives.
So I think I have a rational mind, and I use reason and logic exclusively to judge things.
No cognitive bias, no dogmas, no preconceptions.
So, for examples as for the Kennedys, it is logic that tells me it is statistically impossible that two brothers are murdered with the same modalities, with the same weapons, by strangers who have never met them.
It is logic that tells me that the same criminal minds hired those who killed these two brothers because they probably meant to harm their own interests.
There is no other explanation.
It is a statistical calculus. Reasoning.
I am neither handicapped, nor gullible. So I will never believe that the two Kennedys were murdered by two random people.
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