I always thought "chemtrails" were the dispersion of any chemicals, whether for scientific or military purposes (not skywriting). I have seen reports describing testing of these dispersants that, once drifted to near the ground, could cause health hazards if inhaled.
That's not what is meant by the chemtrail conspiracy theory.
I'm sure what you describe occurs or has occurred. The conspiracy theory doesn't cover the legitimate release of dispersand (a dispersant is an agent that causes other materials to disperse; a dispersand is material intended to be dispersed itself) that may misbehave or cause unintended effects.
Instead the conspiracy theory argues that essentially all commercial and military aircraft are fitted with devices that disperse mind-altering chemicals at high altitude, supposedly to make the populace more docile or unquestioning, or buy McDonalds food and gas-guzzling SUVs. The point is that the only evidence they offer is the observation of persistent trails behind those aircraft and the interpretation that if they were vapor trails from the engines, aerodynamic effects, etc. then they would rapidly disperse naturally and be invisible.
So you have to come to an understanding of "chemtrail" as the conspiracy theorists use it to understand the context for our objection. Yes -- as I said there are many legitimate practices that involve dispersing material in the air. No one here argues that doesn't occur.
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