Russia and Iran are not trying to destabilize and take over the country - by forming, arming, and financing terrorist groups from within and from outside.
They did not bring this conflict to Syria, nor the resulting destruction.
I'm not a fan of a lot of US foreign policy, but people like Assad and Putin are 'not very nice people' to put it mildly, and have done more than their fair share to cause problems in Syria.
Russia has a direct interest in Syria, BTW: https://en.wikipedia.org/wiki/Russian_naval_facility_in_Tart...
http://www.globalresearch.ca/north-korea-a-land-of-human-ach...
— everything you need to know about Globalresearch in a nutshell.
* After the 1980s
I get what you're trying to do. In your mind, before Europe and the U.S. (before white people) the middle east was paradise blah blah. And Western countries are intent to simply destabilize everything right, to some end.
What I don't understand is the millions of refugees are somehow not able to form their own country. What army in the world now has as many as these of age male refugees? If we are to welcome these refugees, we'd be assuming that they can melt into the shared values of the culture, follow the rules, etc. And if we assume that, then we can assume they can cooperate amongst themselves. So why are they not doing so and forming a peaceful country? Hmm, well maybe we have been BUT it hasn't worked out well.
However, the situation in the middle east was quantitatively and qualitatively better when it had Saddam, Qaddafi et all. The region had ethnic and religious tensions for most of its existance, the difference is - before the war in Iraq, Afganistan, Lybia and now Syria, there was a defined pecking order. The biggest asshole had already went through all of the atrocities he had to to become what he is. After US came in, and sprinkled dollars and guns to every antigovernment faction - we now have 20 assholes in every country that vie for the title of the biggest asshole, and they're ready to do whatever it takes. All I'm saying is - take some responsibility for that. Germany and Europe as a whole isn't responsible for upsetting the order that lead to this humanitarian problem. US military adventures did.