You have gotten a reason, you just don't like it. I don't expect to convince a person with socialist leanings that socialism is an awful, evil, immoral system. And for the ninth time, wanting to nationalize health insurance is a socialist idea.
There is no industry that is better served being controlled by a government bureacracy than being served by private industry that I know of. There is no place in the world with such a high level of quality health care as the United States of America. And it is one of the only countries that has a private health care system. Coincidence? I think not.
Not only that, but it is unconstitutional. There is nothing in article 1, section 8 which lists the powers of Congress that allows it to take over the health insurance industry.
Not only that, but I feel that every American should have the right to choose their own health care provider if they so desire. Nationalizing health insurance would allow the government to dictate where I could go to the doctor. That is revolting.
Not only that, but I feel that every American should have the right to invest in or start a health insurance company if they so desire. I believe that everybody should have the right to pursue their living in whatever legal field they desire. I believe in capitalism.
Not only that, but 99% of all government programs cost more than they are supposed to. Social security, medicare, medicaid, space missions, weapon systems, prescription drug coverage, construction projects, everything. Nationalized health insurance would be a horrible expensive, horribly bureaucratic mess. Ashland mentioned the BMV which is a great example. Government services are horribly inefficient, because the government has no incentive to save money, unlike a private corporation which wants to increase profits. The government can deficit spend, or just come crying that the rich aren't paying their "fair" share and pass tax increases which further enslave all Americans, particularly those who have achieved great things in buisness and in their professions, to the wants of the masses.
Just because you don't like the reasons or don't agree with the reasons you have been given doesn't mean that nobody has given them to you.