That's a bit more complicated when there are endless chains of subcontracters and employment agencies from Eastern Europe are involved. It's also more complicated when the employer is also the one that provides the housing. It's more complicated when the employees don't know the local law and don't speak the language. And when a national government is trying to counter that, it gets complicated with the EU because they don't care about the local employees and jobless at all and are extremely strict on policies that might interfere with those subcontracters or employment agencies operating in foreign countries.
So yes, I can blame and do blame the EU.
It's not for the EU to decide to take money from Western European countries and move it Eastern European countries. They weren't shitholes, they were just poor. Now the poor there are more poor, and a lot the people who lived there don't really live there anymore but in a caravan park in Western Europe.
I'm happy those countries joined, I don't mind helping them. I didn't mind Western European companies moving a part of production there or investing in existing factories there. I don't mind Eastern Europeans working in the West. I do mind their low cost of living disrupting the lives of workers there and the job market here. That wasn't necessary at all, joining the EU would have boosted their economies anyway, but they would have developped on a slightly slower pace but in lot better way. Now Eastern European companies have to compete with Western European wages, so those are screwed too and that's probably worse for their economies in the long run.
But the EU doesn't care, they aren't organizing this race to the bottom for the sake of the Eastern Europeans or Western Europeans. Why should they? It's not like we can vote them out.
The UK never joined the EU. The UK joined the EEC, that was a very different organization. After that there was the EC, followed by the EU, and after that there was the new EU with the constitution/Lissabon treaty. A lot has changed. The current EU has been a disaster, that's why it's claiming the successes of the ECSC, the EEC and the EC for itself, together with the successes of all these different social democracies it is destroying. The EU is even claiming Europe, but this continent was already there way before the EU and the richest countries aren't even a member of the EU. People might even get the idea there's no other possible way of European cooperation than this EU.
If the UK was such a financial powerhouse the Brexit wouldn't be a problem, the problem is that the UK is a financial sector powerhouse and a financial sector lives off other sectors, and living off it a bit too well. The City can't live off just the British economy anyway, but it's time for the UK to start beeing productive again.
No, it's due to political choice. In the US the big corporations have an electoral system where they can preselect the candidates by financing the expensive campaigns to make the political choices in favour of them. In Europe the big corporations have the EU to bypass those nasty social democracies with demands about working hours, vacations, wages and stuff that's only very good in the long term for all of the people, but really suck at getting unfair advantages and a lot of quick bucks for the biggest companies. In the UK the big corporations have the Tories and New Labour, they don't need the EU for that, but the City needs the whole EU economy to feed off.
If the EU was reasonable about it, they would just negotiate on base of reciprocity, that's how trade agreements work. But they won't be reasonalbe about it. They will ram free movement of labour through every member state's throat by presenting as inseperable from trading goods, which is nonsense of course, but the EU knows very well who's interests to serve. The EU will rather harm all the other member state's economies than offer the UK a fair deal, they will make sure every remaining member state is scared to leave the EU. That's why they send Verhofstadt as the head negotiater, Verhofstadt is to European integration what Al-Baghdadi is to islam. Good luck with that, but at least you will be free of those fundamentalist antidemocrats like that in two years, the rest of the EU citizens will be plagued by them for much longer.