I'd have a vastly different view on politics if I believed in the Kennedy assassination being an inside job, as your offhand "grassy knoll" comment suggests you do.
Because I didn't even think it was particularly controversial that the official story is bunk. Making no more assumptions about the circumstances of his death (ie, who or how), a conspiracy would be required to produce an official explanation that was lean of some inconvenient facts. But I'm always in the market for convincing evidence that I'm wrong.
Most of what these conspiracy theories consist of is just anomaly hunting, you take a really complex event and try to find any sort of unusual things, which of course you're going to find since it's a big & complex event.
Check out this interview (around 40m) in [1] with Gerald Posner, the author of Case Closed[2] (a non-conspiracy Kennedy assassination book) for a good start down the rabbit hole of non-conspiracy coverage of the Kennedy assassination.
I see how my comment could have been misinterpreted by so many people in hindsight. Sometimes I look at things through a very specific-to-my-experience lens. In another life, myself and squadmates(think coworkers) would get orders such as "Cleric(foreign equivalent of mayor/publicly-supported-bad-actor) <John Doe> and all his/her supporters are threats and should be neutralized". That didn't mean we should protest their policies or otherwise attempt to subvert them...those aren't guaranteed solutions. The finality of killing is a guaranteed solution. If they become a martyr and create even more undesirables through their demise...don't despair - just accept that the list of undesirables has grown and await the very predictable orders. It's tried, true, and only protested until the protester's name joins the list and is subsequently checked off.