You want to believe it's a conspiracy so go a head. Or maybe do some research....like this, slacker: http://amos.indiana.edu/library/scripts/contrails.html
I have already went over the difference between regular contrails that generally last for a short period of time, versus chemtrails which linger in the sky for hours as they spread out, blanketing the sky with a polymer-like haze. If you want to believe they're all normal contrails, then by all means go ahead.
A few independent scientists have found heavy metals and bacteria in what we think are chemtrails. Would you like me to find that information for you?
The thing with conspiracy theories, and why they are so prevalent lately is that any crackpot living in his moms basement with a theory or a hoax can whip up a website filled with "evidence" in 5 minutes, and have a global audience through the web. And weak minded people who need to believe that everything is controlled by a nefarious group of "Global Elite!" from behind the scenes fall for it, and spread this kind of paranoid propoganda around to other weak minded people. In reality, the truth is that "Shit Happens" and everything can be logically explained if you take the time to look at it from an unbiased viewpoint. As for these "Chemtrails"...just water vapor coming from jet engines.