I have some really crazy ideas here, so fasten your seat belt;
Chemtrails have many seperate purposes for the elite, but the primary use for it, is to work as a defense shield for any potential "ailen invasion".
I got this from a potential insider who told me it's purpose about 15 or so years ago, long before the cat got out of the bag so to speak. But it has some other potential uses to the elite.
For one thing, it is a shield against any potential CME,
and this is a major reason why they are doing it. Another is weather modification and outright control over it. Another use is mind control and eventually poison to the human race to cull the population. These people are brutal, and they have a twisted sense of entitlement and justification towards their actions especially when it comes to murder of the population.