One thing I'm finding amusing is that this happens all the time in so many ways around us but you just aren't told about it.
You might hate a certain brand of cheese. Chances are, it is indirectly owned by the same company. Clothing brands, cars, drinks, plastics, glass, you name it. Hell, the tobacco companies do ALOT worse than this - to the ENTIRE population - and they kill people, and they don't get this much heat... They buy their chemicals from the same suppliers as nicotine therapy product manufacturers, but have a larger account so actually dictate to those companies. Did you know they 'persuaded' a certain patch company to down their marketing campaign because it was affecting their tobacco sales?
The difference here is, that 3M told you. Maybe there is such a thing as being too honest.
I do believe, that alot of this goes on in such a manner, utilising all available loopholes to avoid having to tell the 'people' the real facts.
It's just big business - good luck trying to stop it. If you think you have taught 3M a lesson in how to treat customers, you probably have... you've taught them to be more quiet about how they do this sort of thing in future lol.
Seriously, I may be a cynic, but that's how I see it - some things, you just can't stop. I've quoted Tony Montana before, and I'll quote him again. "first you get the money, then you get the power, then... you do what the hell you want".