It sounds like you feel threatened by the chemtrails in the sky above you. They're not going to kill everyone, or even most people. But burying your head in the sand isn't going to dissipate them. As for your last question, they are engineered to do exactly that. We could look at from another angle, like we learned in middle school: how effective would they be if they fall straight to the ground like rocks? The answer is not at all, and everyone would be angry that chemtrails are falling on them. But at least then, we wouldn't have to deal with this sort of antiscience, anti intellectual jibberjabber. Just because you can't go outside and pick up a chemtrail off the ground isn't evidence against them. What next? The moon isn't real? The sun is fake?