A specific cause for Nigerian girls kidnapped by Muslim men should be enough for mainly Muslim refugee/migrant children at risk of sex trafficking by Christian/atheist Europeans?
How do you know this was done by refugees? Even most of the arrested perpetrators in Cologne weren't refugees iirc.
Secondly,
a Human Rights Watch report shed some light on border police sexual harassment in Macedonia:
Lamia, a 43-year-old Palestinian woman from Yarmouk, Syria, who had been detained for 72 days in Gazi Baba in the period from October until December 2014 said she and other female detainees felt unsafe and vulnerable particularly because police guards in Gazi Baba were often drunk: “They drank and they would come at night in our room to count us. Whenever they were drunk and they came to us, we stuck together; we all stayed in one room. Sometimes they tried to put their hands on you.”
Human Rights Watch also spoke directly with Asma, a 20-year-old Syrian woman Fatima had identified as another victim of harassment, who said that the same police officer, “N” harassed her “on a daily basis" during the 148 days she spent in Gazi Baba:
"He tried whatever he could to get me alone in a room with him. He used to approach me and whisper to me that I am very beautiful and that he would help me out, that he would personally look into my case. Then he would invite me to a room saying, ‘Come with me and you can make phone calls.’ Even if I had stayed [in detention] a year, I wouldn’t have surrendered to him. Touching my hair was a daily thing for him. Often he would pinch my cheeks or touch my shoulders and my back and I would take a few steps to escape from him. Once he approached me and said, ‘I want to kidnap you and take you to my house.’ I was very scared."
Asma told Human Rights Watch another police officer, whom she identified as “O” verbally harassed her as well. She said he would often cross her way and say things such as, “What I would do to you if you were not with your group [people she was arrested with].”
Imagine if these were non-Muslim German women describing their encounters with Muslims, refugees or otherwise.