Major events in the past 50 years that don't have many conspiracy theories surrounding them

[Crumpets]

I was thinking this morning that I've never seen any conspiracy theories around the Challenger and Columbia disasters, even though the latter especially happened at a time when everyone saw either "the terrorists" or "the governent" as the culprits of basically everything. I've also mentioned before I think it's odd how much attention every assassination gets from conspiracy theorists except the attempted assassination of Reagan, which everyone agrees was just some weirdo trying to impress Jodie Foster.

What are some other examples of big events that don't have a culture of conspiracy around them (not counting one-off internet randos) and what do you think distinguishes these events from others?

[Crumpets]

Mount St. Helens. Nobody posits the theory that the Soviets had a hidden volcanic lair in the mountain and that the eruption was caused by a failed nuclear weapons launch. But we all know the truth.

The name of the lodge keeper at Spirit Lake killed in the explosion? Harry Truman.