These were old, religious nutjobs (mostly).
And mainstream politicians who decided to pander to that kind of crowd. Plus a few journalists and scientists craving fame.
Unless there was a 'the president is dead' song in the charts it's a whole different thing.
There was a song, but it wasn't exactly chart material. But some satirical YouTube videos concerning the aforementioned nutjobs were pretty popular.
These people are now trying to make a movie out of their conspiracy theory.
A year ago an infant girl died in mysterious circumstances (her mother is now a suspect). Some people immediately used this tragedy to feel better about themselves. Last Christmas a Polish teenager committed suicide (allegedly under the influence of marijuana). It instantly became a point of heated debate among politicians (they even exploited the boy's mother). Unfortunately that's a universal phenomenon...