Yes, it is. In a perfect world, there would be no war, no 9-11, no TERRORISTS, and all of our young men and women in the military would be home safe and sound right now.
That said, had the powers that be thought the way you do 50 years ago, NONE of us would be posting on this board right now.
Presumably you're speaking of World War II. Truman had no other means at his hands with which to accomplish an end to the war. I suspect that, if he had the technological and surveillance capabilities of the current-day military, his decisions would've ultimately been different. He could have effectively directed force at his target as opposed to the populace in general.