3) "Greeks would be received no better than Syrians" is absurd and one of those lines it is hard not to see as trolling or an inane provocation. You can not possibly be serious saying that unless you are clueless about both recent European history (which you clearly are not) and prevailing social attitudes, with resulting prejudices and stigma in Europe. The negative European experience with Muslim immigrants and the resulting Islamophobia is a core factor in these attitudes with Arabs being seen as most problematic group in most countries (beaten by Somalis in some). There is no way mediterranean Europeans from a culturally Christian country would be perceived anywhere near as negative as Syrian Muslims in Germany (talking long term here - not the current spontaneous reception) or other Western European countries and Christian Syrians would be included in the general Arab stigma.
There is nothing that is easier to create than a negative attitude towards foreigners. A million Greek migrants over a couple of years will easily do the trick. Though, in fact, you do not even need that. The speed with which Ukrainians became hated on the Russian street (these days they frequently get worse attitudes than Chechens) is a great example - and you are gravely mistaken if you think this could not happen in Denmark. I am pretty certain, that, under the right circumstances, it would take 6 months or less for Norwegians to start being assaulted on the streets in Copenhagen. And, of course, you would be writing lengthy explanations here for why that would be very understandable.
