Unfortunately, the unspoken truth is that Eastern European countries have a huge unaddressed problem of deep racism. They have not gone through the experience of being target for economic mass-migration from other continents yet, unlike most Western European countries have been for more than 50 years now (and still struggle with the issue occasionally, but with much softer undertones). Countries like Hungary will do the bare minimum required to keep their EU funding and will likely not even try to really help these people, which means the quota system might end up being an exercise in futility. We still have to try though, it's the only solution. We must hope our Eastern fellows will eventually find the compassion to change their ways.
Families still remember their property being taken away and re-purposed, the (huge, up to one third of population) Russian minorities in the Baltic States by large have not integrated well over many generations now.
Fresh memories of the past and issues still present (understandably) spawn distrust and xenophobia among the locals.
> Politics in Europe will never be the same as the majority of the young do not carry any of the previous generation's values.
First reaction: boo-hoo. More reasonable reaction: the Eurozone's population is about 330 millions right now, are they really expecting 100millions+ refugee? Yes, right now the refugees are concentrating in just a few countries, but that's because of the EU's attitude and passing-the-ball solution so far. The area as a whole CAN take on the refugees.
The same argument on the scale can easily apply to most of your other objections really. But the most important point is as simple as this: it's a very shitty situation all around, but does the anti-refugee camp have any proposed solution besides "tough shit, they are not my problems"? I mean, I can see people being selfish, and that itself is not a problem, but let's just call a spade a spade? EU citizens are all within their own rights for vote for their Trump-equivalent and build a wall around EU.