Except it's the exact opposite.
The UN and other international organizations like the World Court (ideally) take the entire world's views into account.
A lot of people seem to think that pre-UN days power was decentralized. There was no global entity, so no centralized power, right? Wrong.
Power was even more centralized. The powerful nations did whatever they wanted with the smaller ones and there was absolutely nothing that could stop them. Hence the brutal invasions, colonization and oppression in pre-20th century.
At least post- WWII, there's SOME pretense of democracy. The invasions by the powerful are less frequent (only the US and to a much smaller extent, Russia, get involved in them) and much more scrutinized. They're much less bloody, as well. In the early 60s, when the US attacked Vietnam, the UN was pretty much silent and the US destroyed at will.
40 years later, it had become more democratic and it widely condemned the Iraq and Afghanistan invasions. The political and diplomatic pressure it applied certainly prevented lot of extra suffering.
International relations are a fact. You have to address them. So you can support structures that at least have the potential to be democratic, or you can be an isolationist skeptic and let the powerful do what they want.