I don't think that this is fair: so it’s just your inner prejudices
Mass migration, usually after wars or famines, does cause upheaval and people should be able to discuss.
More often than not people who are on the move, in a legal or illegal manner, are suffering the consequences of whatever drove them to make the journey in the first place, from the journey itself, and from landing in a place that often does not want them.
The tragedy of it is overwhelming.
They are never settled in middle class/upper class areas though. As such, middle/upper class moral and ethical discussions around the issue are a little abstract in their nature.
They are always settled in poorer areas with existing challenges like poor infrastructure (schools, housing, medical, child care, transportation etc), housing, jobs etc. Therefore the ethical and moral discussion around the issue will not be abstract and it needs to be heard too.
We have plenty of variety of nationalities and religion where we live, it is harmonious and there is a lot of cultural exchange.
Without the money and the freedom that brings, I do wonder how it would be.