If the government was spraying aerosols into the atmosphere, what possible purpose could there be for such behavior? One can dream up a litany of possible motivations, but not one of them have anything to do with our good. I don't know if the government really is spraying aerosols into the atmosphere. But one thing I do know, it's not unthinkable and it's not "past them."
You think the government seeding the atmosphere with poisons or deliberately sabotaging the planet with greenhouse particles is unthinkable? Think again. When you think of people as cattle and yourself as the rancher, the inevitable result is Mengelean pseudo-science and social engineering experiments. Nothing but nothing is past the sickos ensconced in the Pentagon, CIA, NSA, FBI, and the rest of the asylum for those with delusions of grandeur known as "Washington, DC."
And, of course, the government is always "immune" from the consequences of its own actions: "The Nevin family appealed the suit all the way to the U.S. Supreme Court, which declined to overturn lower court judgments upholding the government’s immunity from lawsuits." I have no idea whether they're presently spraying us or not, but one thing's for sure: I don't put it past them.