So
... what if I suspect YOU have knowledge of an imminent attack? Are you okay with me chopping off your fingers, one joint at a time, until you tell me what you know? Sure, at first you'll protest that you don't know anything about any attack, that you're a loyal citizen, but I know that's a lie. Snip snip snip
... why won't you tell me where the attack is going to take place? I'm running out of fingers, soon I'll have to start on your toes.
And as for "Fighting the enemy with all means necessary is the ONLY way to win a war." -- okay. Let's say you're in charge. Here's a document authorizing bombers to nuke the Middle East, North Korea, Libya, and anywhere else considered to be part of the extended "Axis of Evil" until the ground has all turned into glass. Please sign it. That's guaranteed to kill all our enemies in the regions and nuclear weapons are part of "all means necessary" -- are you okay with ordering the deaths of millions of people, many of whom are innocent, to defeat the enemy? If so, please report to the nearest mental hospital and check yourself in as a psychopath. If not, then we agree that there are lines we should not cross -- now we just need to negotiate where they are.
Since I suspect you're going to bring up Hiroshima and Nagasaki, remember that the US Congress had formally declared war on Japan and Truman specifically instructed the Secretary of War to select military targets for the weapons
according to his diary. It was not indiscriminate bombing but carefully planned and targeted attacks.