"You call that "united"?"
"Union" and "United" are the same word, so you could make an equal criticism of the EU for not being "united" enough because laws happen to vary between Germany and Spain.
What if some bureaucrat decided to move your family and 10 others (from radically different cultures) into big house? You can all agree on who cleans what common areas at what times, who cooks, what pets everyone can have, when are the quiet hours, etc. Does that sound appealing?
If so, then I see why you have a different opinion than I do, and I'm not sure we'll ever agree. If that doesn't sound appealing, then you should acknowledge that "united" is only good in reasonable doses.
The problem is that it's too easy for the majority on an issue to feel like they are universally right, and it's just fine to impose their will on the 40% minority. But the people in the minority rightly feel oppressed. And guess what: opinions change and sometimes you will end up in the minority, so it's a good idea to set up a system of tolerance where people can live in the same country without telling each other what to do in every situation.