"the most plausible situation? So we are to believe what the goverment says because it the most simple explanation and fits the evidence? evidence that they themselves feed?"
I'll leave the most important point for last.
As to its being the most plausible explanation there's a rule of thumb called Ockham's Razor.
Now for some illumination on Contrarian psychology. In the 1960s the Tobacco Industry, facing Government regulation on cigarettes, went on a massively funded campaign (about 100 million dollars) to propagandize the "safety of cigarette smoking.
There were a lot of scientists who eagerly prostituted themselves to the Tobacco Industry by generating falsehoods, including pseudo-scientific reports, claiming that "the science had not been settled". These prostitute scientists were not even Oncologists (who study cancer) but were a motley crew; from different specialties including Geologists and several Nuclear Physicists who had worked on the Alamo project.
What the hell did nuclear physics have to do with the connection between cigarettes and lung cancer? Absolutely nothing. Why? Not because they chain smokers. They were, consistently, Republicans and Libertarians.
What did their ideology have to do with the issue of cigarette caused lung cancer? Everything. Why? Not because there's anything specific in those ideologies about cigarettes, lung cancer or science. Nor did it have anything to do with their being chain smokers. Nor was it necessarily a financial motivation. The reason had nothing to do with the 'factual' or the 'logical' but it had everything to do with the psychological.
The psychological issue is known as Contrarianism. If you despise someone or some social group or structure, you will have a tendency to formulate opinions that are the exact opposite of those you despise.
Those scientists were rigid ideologues who; seeing that the institution they despised was going to take action restraining the absolute freedom of a Corporate entity; used the typical Contrarian logic of "If my enemy says it, then it must not be true".
The issue of this thread, a silly and typical paranoid conspiracy theory, is pure Contrarianism. You could respond to its individual points but soon you'll see how its adherents generate contrarian theories one after the other while being immune to reason. It becomes pointless to maintain a posture of pure analytical thinking. You can't reason with psychotics or, in the case of those who puppeteer them, psychopaths.
* * *
Now, for the most important issue. You spoke of evidence that the Government "themselves feed". Who's feeding you? No, absolutely not. You're not feeding yourselves. You're being fed; whether you admit or not, even if you don't consider yourself one of them; by those who are on the political Right (It's no longer meaningful to speak of the "far right"). They themselves, have some of their mouthpieces associated with; influenced by; or outright funded by Corporate Psychopaths such as the Tea Party funded Koch brothers (vis a vis Americans for Prosperity).
Contrarianism is not a thought process. It's a form of psychosis. This nation is suffering from mass psychosis.