Lets say chemtrails are real
An agency is letting chemtrails loose all over the country.
For what possible reason?

To inflict disease & harm to its own citizens?...that myself i find hard to belive, as it would be more logical to create a disease, airborn via genetic mutation into the mainstream population, has it would be more effective.

But what if its used against "aliens"?

If certain aliens can walk with us in the streets without being reognized?...if they have cloaking abilities?..how is a agency meant to deal with them?..for what purpose they would want to inflict harm to them is unknown, but lets say they do?..would chemtrails not be usefull?....if you know of a substance that is harmfull to the aliens..what better way than to harness the substance in question...modify it to your own needs, and spray it onto the air above?

Just another theory...onto the uknowns

Well as far as explanations for chemtrails go, that is as good as all of the rest of them.

its not to harm us, its for mind control. once the chems get into your system you are theirs to controll