I cannot think of a less useful way of dispersing poisons, infertility drugs, and mind-control drugs than by spraying them out the back of a plane at 38,000 feet.
ETA: I take it back. Digging a hole 38,000 feet deep and pouring chemicals in there with hopes that it will enter the groundwater may be less useful.
MORE ETA: I take back my takeback. At least with the chemicals in the deep well, you can target people within a mile or two of the hole. If you are spraying chemicals from a plane they could easily end up 20+ miles from your target.
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As for your opening post, Mr. Sisyphus, all I can say is " You cannot reason someone out of a position that they did not use reason to arrive at."
It is worse than that. Spraying anything from that height would first cause most everything to dissipate so much to be completely undetectable by the time it reaches the ground. It could end up not only 20 but hundreds if not THOUSANDS of miles away from the location it is sprayed.
The majority of "evidence" "chemtrailers" have is they SAY that contrails always dissipate and ONLY "chemtrails" persist. Since a contrail is essentially a cirrus cloud, by saying it never persists and always dissipates they are also saying that cirrus clouds can't exist.