Well, South Korea and Japan being involved would just be one factor that makes justification even easier. The real reason would be national and global security. It's in the interest of preservation of freedom. You don't wait until the enemy is at your doorstep, because that means you allowed them to snowball an avalanche at you. You meet them at their doorstep before they've gained full momentum.

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aurareturn 3 hours ago | parent [-]

Do people still believe it’s about freedom?

	▲	CMay an hour ago \| parent [-]
		Absolutely, because it is. Sometimes it's about X, because X is also related to freedom. Let's set X = oil. Oil is a critical resource that is huge for transportation. If you are the one that controls it and people need it from you, that gives you leverage to encourage them to do what you want. An authoritarian country that engages in mass killings and torture of its own people could get away with a lot and even abuse other countries if it has enough oil. You can apply this to nukes and many other things. Like maybe you defend an ally. Why defend an ally? Having them makes you stronger. Why do you need to be stronger? To defend the way of life you believe in.