I'm just a neutral bystander stating an opinion. Same as you and everyone else not privy to all of the facts and details about it.
What I say is my take on it. Does not mean it is right or wrong, and shouldn't be taken as it on this topic. Don't get all afraid or astonished, it will be a waste of your time and energy.
Its amusing to me that people think they are so strong and have full control over their minds and thoughts. You have some control, but I can assure you, its not total control. There are levels of depth in which control on people work. Without getting too far into it, if you have purchased something you've seen or recognized from TV or any advertisements, whether you believe me or not, you have been controlled in a very light way, to purchase that item/brand, over others, and you don't even realize it. When you associate yourself with one party specifically, and vote that way (for example, the upcoming presidential elections), your mind has been persuaded and controlled.
You're just assuming that because there isn't a voice thumping along in your head saying "CHOOSE RED NOW SLAVE!" that you are in full control. I promise you. You are not.
Humans are far from perfect. But one thing they are great at, is being controlled, manipulated, persuaded and used by other humans, far more easily than any would expect. If you've got active brain activity, then chances are incredibly high, that you can be controlled, manipulated, and persuaded quickly. The larger the group of humans are, the easier they become to control. Passively or aggressively alike. That is just how weak minded we are. So don't think that just because you THINK you are strong, that you are. Because... you aren't.
I feel bad that this Marine ended up in a mental institution. Its a shame. The ROI from the amount of time and effort spent on training him, is an overall loss. But he chose to project what he thought was the right thing to do, but very likely, in the wrong direction, to the wrong audience, and more so, at the wrong place and time too.
The world is a chaotic place. Sometimes what we think is right, is actually wrong, and vice versa. That's just how things work. Welcome to the suck?