In many previous migration movements in both Europe and the United States there was some rateable factor between the native population and the migrants. For example, people coming to the US from Cuba were seen as escaping communism for democracy and were seen as good. Similarly with Vietnamese immigrants for example. In Europe the same thing happened after 1991.
Conversely now, other than the fact that the migrants are of a different skin color and religious make up than the majority of Europeans, society does not have the same sympathetic view as compared to the past. There were not Cuban or Vietnamese terrorist strikes on American or European soil, and thus the new migrant wave is seen as a risk.
Also given that that fact that we are still at 'war' with the middle east doesn't lend any help. It is easier for a society to forgive a nation/ethnicity that they've been fighting after said nation has won than while they're still in conflict.
Overall I think the situation is very complex, and theres not a easy way to make Europe accept this wave of migration in comparison to similar waves in the past.