Did they have the same opportunities for employment and schooling that other had? Did they have equal opportunity with others in job interviews etc?
This would have been impossible, you have to keep in reality's bounds. Besides discrimination, prejudices and hatred exist in both directions. And they started with linguistic barriers, no connections, no capital, etc, social mobility takes many generations in all countries.
Yet this did not prevent other groups to assimilate themselves.
There will always be ethnic favoritism.. People of a group trust people from this group more than others, and prefer to live and work with people from this group (even when they claim the opposite). This is true for whatever skin color, religion, political ideas, social class, etc you consider. This will always create insider groups and outsider groups.
There will always be ethnic prejudices.. Prejudices are an integral part of intelligence, we are unable to think without them. Since there will always be favoritism, there will also always be prejudices. And since there will always exist insider and outsider groups, then there will always be groups more prone to criminality, rebellion, violence, etc.
You can deconstruct the colonial image, and I believe this is now nearly complete as western countries advanced very quickly on this point during the past decades. But past this you have to realize that as long as there will differences, there will be favoritism, inequalities and prejudices. We did collect the low-hanging fruits of anti-racism, the only improvement margin remaining is for minorities to amass capital too, so that each group will have its own dominions where it will dominate and oppress outliers.
Post-racism is when you realize that racism will always exist everywhere. From that point on, you suck it up and understand that multicultural societies are unstable and prone to conflicts, distrust, individualism, segregation and secession. Eventually it leads to explosion or assimilation. Look at History.
And maybe one day you will understand that the problem with Muslims in Europe is not a social one. The problem is Islamism, a totalitarian far-right movement that is rising all around the world, especially in countries where Muslims dominate.
