Well, I sure don't know why Lincoln or Kennedy were murdered.
But it does seem absured for US to print money, and then pay interest on it to get it into circulation. I think I understand that it is based on treasury notes which are interest bearing, and hence loans to the government.
But why not just print and spend the money on government projects, and regulate the tax struture to bring it back in after an appropriate time?
It should be possible to determine how many dollars should be in circulation at any given time, and not exceed the necessary amount so as to avoid inflation.
I doubt the major bankers of the world would like it very well, and therefore, it won't happen.
But I think it would be a good thing for our economy.