Agreed with the thrust of your comment, but I want to pick a particular nit out of curiosity: how do you determine that the EU is the cause of European peace when it has only ever existed under the NATO security umbrella? (no doubt EU has strengthened cooperation within Europe, but how do you attribute peace to it rather than NATO?)

Because the EU in itself is a pact of no agression between european countries?

Before that it was a fuckfest, name a country in Europe who hasn't been invaded at some point in time by a neighbouring state

You missed the point. How do you know that it was membership in the EU and not membership in NATO that deterred aggression? NATO predates the EU by a long time and there hasn't been war between NATO members or military aggression by a non-NATO European country against a NATO European country. A non-aggression pact without NATO enforcement is easily broken.

I’m not OP, but I will offer my point of view:

NATO is only defence in military sense from external threats.

Internal relationships are much broader: trade, laws, internal politics, multi-country alignment towards same goals, even goal definition etc. there is european parliament where representatives from all member countries gather and discuss a lot of different topics. none of that provides NATO.