I agree with you, but you can't just have a policy of invading or interfering with sovereign nations because you find their culture to be vile and immoral, right?
Wrong. Invasions are a last-resort thing, but interference is a must. Cultural rights cannot invalidate human rights if we are ever to have a better world.
That sort of policy works both ways.
Sometimes conflict is inevitable, in all senses of the word. To do nothing is worse.
If they are not harming you or your interests there is no cause to be belligerent toward them.
And if they are harming the interests of their own people? That I was born in-between a certain set of invisible lines does not keep me from caring about the well-being of those born between other invisible lines. Just worrying about yourself isn't enough, because none of us are divorced from the world, in both the personal and national sense. What happens anywhere, to anyone, will in the end have some sort of effect upon you. That effect can be a lot of things if you're a world away, but positive events generate positive echos more often than not.
Well, you can always form a separatist movement and secede or overthrow the government from the majority. Many separatist are indeed oppressed minorities that can't just move to a nicer country on a whimsy.
The effects of war are far reaching and very often are worse than whatever you were trying to prevent or solve. Far better to live in a society that is capable of solving its problems without violence or having one party pick up their ball and go home.