Now, for the people who mistakenly believe that mustangs "belong" in the wild and should never be managed or tampered with... don't even get me started. As has been stated, they are feral animals that actually do much better when reunited with the species that initially brought them here and had so much to do with their breeding in the past.
You are the second or third person to say Mustangs are feral, not wild. Not trying to be a wise guy here, but do you know what feral is? If not, it is wild.
Wild is wild, whether never domesticated or feral. Feral simply refers to animals descended from animals that were domesticated.
I also respectfully disagree that they "do better when reunited with the species that initially brought them here". On what do you base that? While it is true that parasite control lengthens the natural lifespan of all horses, the same could be said of any grazing animal. Personally, I am of the opinion that Mustangs, as with all wild animals, are most content being left alone.
That doesn't mean I oppose capturing and taming Mustangs, or oppose people that own them. But it is, in my opinion, rather far fetched to say an animal is better off confined and used as a beast of burden than running wild to pursue its instincts, which is what brings it contentment...