There are millions of Germans who favor open borders, among them some of the most powerful people in the country. Case in point:
Katrin Göring-Eckhardt is one of the leading members of the German Green Party. It wins between 10-15% of the vote in national elections, which is a lot in a parliamentary system like Germany. Easily enough to make or break coalitions. The Green Party has been in governing coalitions in many German states and was in the ruling coalition for all of Germany just recently. She has said (g, my translation) "I really hope Chancellor Merkel decides to go to a refugee hostel sometime, listens to the stories the people tell, and then says: 'Yes, these are the new citizens of our country'."
She did not say "These are the migrants whom we will house humanely while their legal status is decided." Nor did she say: 'These are the refugees to whom we will provide temporary refuge to until conditions have improved in their home countries and they can return." Nor did she say: "These are the immigrants who may one day qualify for permanent residency status in Germany."
She said that Chancellor Merkel should expressly promise all the migrants she meets that they are already citizens of Germany, merely by virtue of arriving on its soil.
This is open borders, pure and simple. No country in modern history has ever implemented such a policy, for very good reasons.
I hope this settles the argument about whether 'open borders' is merely a straw-man argument. Real people with real power in Germany want it to happen, or at least claim they do.