It is because when the DOD studies an issue they really study it. Their report will have great credibility and a major impact on how homosexuality is viewed, not only in our military, but in our society. If the DOD report shows that having homosexuals in the military negatively impacts our combat readiness, the health, morale and welfare of our forces, and presents long term risks to the sustainability of the force, then the barriers to looking at homosexuals in our society will be broken down. President Obama, Senator Levin and Speaker Pelosi cannot let that report get out to the public because support for repealing Don't Ask, Don't Tell will collapse.
People will begin to say well if homosexual behavior negatively impacts our military does it not also negatively impact our society?
The federal government has not seriously studied the long term impacts of homosexual behavior on the individual, their partners and society as a whole. This DOD report could open the way for further studies by other government agencies like Health and Human Services on homosexuality. Researchers would feel emboldened to study the impacts of homosexuality on our healthcare system, businesses and social policy. It will open a Pandora's box that President Obama wants to keep the lid on.
I have written about the negative health aspects of homosexuality here, and here. It is critical that the DOD report be completed and released to Congress and the American people before any legislation repealing Don't Ask, Don't Tell is considered.
Here is a video from FRC Action on what our generals think about repealing Don't Ask, Don't Tell: