Those kooks don't understand contrails. They believe they are chemicals used by the government to control our minds.
Y2K was the first Internet Age craze. For the first time, lunatics could gather in great numbers and exchange "information".
Previously, conspiracy nut causes like anti-fluoridation had far greater difficulty maintaining communications and publicity.
With the internet, whole nutbag communities can flourish, and they have.
After Y2K evaporated, the nuts needed a new rallying point, and a paranoid schizophrenic somewhere came up with the idea of chemtrails.
It took off like wildfire, but eventually the 911 conspiracy nuts won out, and marginalized the chemtrail nuts.
Soon, the BFEE nuts, trying to figure out how Rove was able to kick their asses twice by stealing Florida and Ohio, pushed the 911 MIHOP and LIHOP nuts into padded cells.
If the jug-eared muslim loses in November, a whole new generation of conspiracy nutcases will be spawned, and they will likely label all the BFEE conspiracists as lunatics, and take their place as the pre-eminent community of nuts.
Of course, the internet is a big place, with room for more than one community of lunatics.
While the BFEE haters (along with their subgroup, the global warmers) are currently most prominent, groups like the anti-vaccination nuts and the cellphone-brain cancer nuts can still prosper.
These nutcase communities are always stalwarts of the democrat base.