The EU can barely fight the US. Do they want to get into a costly war with the US over Greenland? That's it. That's literally the only way the heads of government think, in dollar signs. Is the cost of going to war with the US worth more or less than Greenland.
Russia, the US, and China are all making their moves to define the world for the coming century. World War 2 ended 80+ years ago. It's unfortunately natural for humans to want to fuck shit up again.
Plant a tree. Volunteer at your local food pantry. I am a full believe in tackling smaller problems more local to you. Trying to tackle the world's problems will only end up with you feeling angry and sad all the time.