Probably the same reason that the EPA is turning a deaf ear and blind eye to the issue. Not enough national or International awareness has been dredged up in regards to Chemtrails. They fly over us like mavericks basically crop dusting huge cities and our crops and fields that we rely upon for our food production sources.
The news is not appropriately following this story, they hardly ever report anything about this. Meanwhile, millions of people are effected daily by these chemical assaults. The medical community is not aware of this either. When millions of people dash into the emergency rooms with strange respiratory infections, asthma, allergies, heart ailments, etc... they are not linking this to the biological warfare that is being used in the aerosol attacks towards humanity.
I've written 10 Hubpages dealing with this topic. It is HUGE in scope, in fact completely GLOBAL!!! However, because it is not being reported properly, people do not even know about it. It is a rare person that looks up to the skies and even questions what they are seeing in the clouds.