Why is Yoga being separated from Hinduism?

For years Native Americans have pointed out that their spiritual traditions are being appropriated, misrepresented and sold to mostly white people by New Age entrepreneurs.  Here is another example of a cultural rip-off practiced this time against Hinduism as reported by the blog - Spiritual Bangalore

"...Christians, Jews, Muslims, Pagans, agnostics and atheists they may be, but they partake in the spiritual heritage of a faith tradition with a vigor often unmatched by even among the two-and-a half-million Hindu Americans here. The Yoga Journal found that the industry generates more than $6 billion each year and continues on an incredible trajectory of popularity. It would seem that yoga’s mother tradition, Hinduism, would be shining in the brilliant glow of dedicated disciples seeking more from the very font of their passion...

Why is yoga severed in America’s collective consciousness from Hinduism? Yoga, meditation, ayurvedic natural healing, self-realization–they are today’s syntax for New Age, Eastern, mystical, even Buddhist, but nary an appreciation of their Hindu origins. It is not surprising, then, that Hindu schoolchildren complain that Hinduism is conflated only with caste, cows, exoticism and polytheism–the salutary contributions and philosophical underpinnings lost and ignored. The severance of yoga from Hinduism disenfranchises millions of Hindu Americans from their spiritual heritage and a legacy in which they can take pride." ...(Cont.)...