But the ECHR has nothing to do with the EU... it predates the EU..
Not the ECHR, the EUCJ: since the EU's "constitution" mentions values and human rights, the EUCJ uses it to intervene on every matter, even those who are not EU competences.
And those judgments prevail over national laws! Not like EU directives who first need to be transposed. As a result, if you want to ban familial immigration, you need to change your country's constitution to specifically mandate your judges to ignore the EUCJ rulings on those matters.
Well it was put in place to prevent another Hitler..
No, the coal and steel community was. However the somehow more recent idea of forging an European empire at the expense of existing nations, which the EU is becoming, is no different from the conquests of Hitler and Napoleon. Actually the EU goes further since neither Hitler nor Napoleon dreamed of forging a new common identity, which requires to first destroy (marginalize) all European cultures and languages. Such a project can only be achieved by force and tyranny.
Besides blaming nations is an absurd and shallow reasoning. For one because destroying nations to create a new one is only displacing the problem. For two because any identity can derail into outgroup hostility: nations can birth nationalism like religions can birth crusades, removing nations will only lead people to adopt other identities with similar problems or worse: Nazism and fascism were born as a reaction to the weak national identities of Germany and Italy, because people felt the need for a stronger community in times of crisis. For three because jingoism was not caused by the existence of nations, it was caused by circumstances that made people turn to totalitarianism.
Besides of its own imperialism the EU laid conditions that will greatly help the rise of extreme movements in the upcoming decades. First of all the ww2 was the child of the 1929 crisis. And about every economist today would agree that the EMU made the 2008 crisis worse over the last eight years, and now poses a very significant danger of a further global economic collapse. The EMU was always ill-conceived, amateurish, plagued with systemic and dangerous problems, and those problems have been revealed to all informed people after 2008. Whatever economic advantages the EMU may have had (or not) for some some of us, it has eventually proved to be an extremely hazardous and dangerous gamble for the aim of forging an European identity.
Second of all the EU rendered our political powers weak, unable to solve problems. As a result mainstream parties lost their legitimacy and this made the extremes look like more reasonable alternatives than parties known for not solving anything. One preeminent example is immigration: all regular right-wing parties and electors would like to decrease immigration, yet immigration has constantly increased and we are now supposed to become multicultural and multiethnic countries. In other words we are supposed to become Franco-Islamic, Germano-Islamic and Italiano-Islamic countries and cultures, which should be a disgusting idea for any progressive, a great step backward for the European civilizations, and something that most of electors absolutely do not want.Yet no mainstream party has been able to change this because the EU, EUCJ, ECHR oppose the necessary reforms.
In the upcoming decades European countries may know economic collapses, civil wars, wars, and genocides. And the EU will be the first culprit.