Thanks! Of course, this is just another example of "things that are not chemtrails". Unless you go and define "chemtrail" as "chemical sprayed from a plane", in which case there are hundreds of different kinds, so what is everyone arguing about?
In some ways the more organized they become, the easier it is to focus a rebuttal. However, there's the flip side in that they reach a wider audience, larger number of believers, which then fragments in various directions.
What's the harm? Here's an indication - from aircrap.org
Some people are inevitably going to feel strongly enough about this that they take some kind of unfortunate action, possibly harming others.