You are exactly right.
There is no rational argument as to why Obama's re-election would be better for America (or even equally good) than would be Obama's defeat by Mitt Romney.
Those who counsel despair, who counsel indifference, or who do nothing but disparage Mitt Romney, are working against the interests of the United States of America.
There is. It has been explained to you by none other than Jim Robinson himself.
Romney will sellout conservatives. He has a liberal record and a history of governing by political expediency. When that happens, Republicans will lose control of congress and a Democrat will take back the White House, probably by 2016. A Romney Presidency is going to be as bad or worse than Bush Presidency, which was total failure.
Sitting back and ignoring that possibility makes you a willfully-blind fool.