I am just as unhappy as you about the division of the Korean peninsula caused by Truman firing MacArthur, but I can understand his concern about a full-blown Third World War if we engaged Mao's armies directly. We know much more today about the weakness of the respective positions of Mao, Stalin and Kim than we did in the early 1950s.
But let's for a moment grant that Truman was right. If so, then just what does Obama think could happen that is forcing us to fight a limited war now? Seems to me the best argument for encouraging the Israelis to make a full-scale attack now is to **PREVENT** a much bigger war later.
It’s our rules of engagement that tie our hands and force up to fight a limited war.