Because all it does is draw emotions and easy analogies - which are not useful.
Instead, it's more important to consider the EU in the context of the post-cold war era of the 1989 collapse of the Berlin Wall and the consequent collapse of the Soviet Union.
That's "how."
A would-be European super-state is trying to bring Great Britain under its hegemony, and you don't think there's room for an easy analogy?
“Instead, it’s more important to consider the EU...”
Could you elaborate? I am being sincere. So much goes on in the world today.