It's deliberate.
Look at the photos from a week ago. All young men. Then people started noticing this and talking about it. Almost immediately, no more photos of men.
Funny though, yesterday I was listening to a story on NPR (of all places) on the plight of Syrian refugees in Lebanon. They spoke with a young woman whose husband had left for Germany. She lived amongst other Syrian refugees, all women and children and lamented on the difficulties of carrying the heavy propane tanks she uses for cooking up to her apartment. "There are no young men to help us anymore. They've all left for Europe."
I guess NPR let that little detail slip through.