You are right for not taking written word as gospel. But if we get back to the issue at hand: Obama HAS signed an act that puts one powerful company above the law. AND this law was written by someone paid by this company. It is perfectly legitmate to ask WHY a president signs such a law. The outcome of this act is more or less predictable. But to ask WHY he did this has nothing to do with conspiracy theories. And this is only one example for numerous weird "coincidences" in real-politics. Since answers to this kind of "strange behaviour" are rarely given, it is small wonder when observing people suspect foul play.
If we talk of eye- witnesses- well, I am an eye witness of what Monsanto (and others, of course) does to the environment. And again: The outcome of their destructive work is predictable. No mysteries here. And now Monsanto is untouchable. At least legally. And since this is so, one is bound to find other ways to "touch" them.