Turkey population ~75 million has accepted 1.5 million of them with ~200,000 more looking to enter the country.
For scale there are around 10 million illigal immigrants from Mexico. Picture another 5 million showing up next year with zero notice.
Don't get me wrong I think most countries could accept far more immigrants, but the much of the world is a long way from what most HN are used to. Consider, ethnic cleansing' is not just something that happened in WWII, it far more common than people want to admit. Poverty, language, ethnicity, and culture are real issues and complex issues.
PS: I think most people should read though every item on this list at least once. http://en.wikipedia.org/wiki/List_of_ethnic_cleansings And then realize a lot of things did not make the cut.
Okay, so you accept 5% of population, it doesn't help much the rest 95% of it. And then you struggle to assimilate them and may become a warzone yourself.
The commenter was talking about "slowly" adjusting rules and a very thought-out plan. Not "next year" and "zero notice".