With Europe having gotten to the state it's in, I see it this way:
If my grandparents wanted the Germans dictating everything we do and say in the UK, the Windsors would still be Sax-Coburgs, and we'd have joined the party on the side of the Russians, the Germans and the Japanese - as it stands, we fought tyranny, oppression and a central government intent on depriving its citizens of basic human rights, which is basically what they're edging towards.
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Lol. Beware of the tyranny, oppression and assaults on human rights that are now done the.. EU.
Firstly, the main reason why WWI and WWII happened is.. Nationalism. That's what the Germans and the Japanese had, strong, independent, authoritarian goverments that put the interest of their nation above everything, including peace.
Secondly, ask yourself who the modern nationalists are and what they support. Farage, Le Pen, Orban, Putin they all have things in common. They 'love' their country, they shun international cooperation, they put their country first at any cost. If we let these people gain more power we will go back to where we started at the dawn of the 20th century. Only this time, we are capable of causing infinitely greater destruction.
You're position is on the wrong side, the same side against which your grandparents fought.