It wasn't justified for America to declare war on Japan for bombing Pearl Harbor?
War with near-genocidal intent, ok, yeah, it's ok to shield yourself, kill the genociders as bloodlessly as possible, but what if you are genociders yourself? But let's look at the ongoing wars.
War in Afghanistan (2001 on): it was unjustified for the Taliban to attack, and fear-war the republic government, but it was unjustified for the government to shield and do draft, as that means the killing of innocent folk to stop, what, some oppression at best that most Afghans upheld to some extent, anyway? Killing is only justifiable if it will be sure to stop other killings, and that's not what was happening. And then America, yeah, it's evidently in the wrong.
War in Iraq: clearly unjustfied for America to attack, they had not even any proof of WMD, that's just an excuse, and some Americans dealt with the Iraqi pretty bad - some war crimes were done, read about it all on WikiLeaks, but the draft or war was not justifiable on the Iraqi side either. And Mashriq is evidently unjustified, and the fight against them is - they are doing genocide and dread killing democide.
War in Syria: justified peaceful rebellion, very unjustified riot watch, but mostly unjustified riots afterwards, unjustified on Kurdestani independence, unjustified on Mashriqi invasion, justified to shield against the Mashiriqi invasion.
West Land War: unjustified on the Islaamists, and justified shielding against.
Also, if you like innovation and technology so much, then how about fund the sciences and like organisations more, so that the things invented would be more likely to have a purpose outside of war, and hopefully won't make Earth even easier to wreck.
Because I can't choose what country I was born in.
I'm not willing to fight for any country. I will fight to shield the lives and health those near me, but they wouldn't even be in hazard in the first stead if my government did not capitulate, so it's half my government's blame for it.
Edited 6/23/2016 04:41:58