If I had to guess what this is all about....I would first toss aside the idea that chemtrails are for the purpose of culling the population. That explanation just doesn't make sense to me. I think it is a diversion from the real purposes......because there are probably more than one. Among these possible purposes may be military communications, military shields of some sort, perhaps they function as part of a weapons system. They may be a contributing factor which helps to facilitate weather and tectonic weapons, climate control....or climate terrorism....etc.
Chemtrail emissions may not necessarily be good for us but I don't feel that they are intentionally being created to make us sick. There are much cheaper ways to reduce the population ...if that was a real goal.Our junk food diets, modern medicine(treating the symptoms and not the cause), and biological warfare are already contributing to a vast increase in chronic illness and early death. We are not being told the real proportions.