Ignoring your second sentence as it detracts from anything you said afterwards.
I’ll like to focus on the first point.
If crimes are being committed disproportionately by expats, we should look at the economic situation of those committing crimes vs other demographics, as there is a large crossover.
So that leads us to the question, is it expats commuting more crime or is it poor people committing more crime as expats are generally also in the poorest section of a society.
Correlation isn’t causation.
Ice cream sales align very well with drownings. Does this mean ice cream makes people drown or more people eat ice cream on hot days and they also go in water more in hot days.
Edit: To take your second point. Anecdotally from the UK, it’s the people born here that are more likely to be claiming benefits and having loads of children, not the expats coming here. They actually work very hard. The Asian community is always out feeding the homeless and the first group out cleaning the streets of Manchester after riots a few years ago and after the Scot’s came down for football and tore up the city. They were the first ones out after the Manchester bombing bringing food and stuff for emergency responders.
To your third point. Sure we have communities popping up which are predominantly the same race of people, but wouldn’t you want to live in a place with people you have more in common with, integration takes time.
The only community that I rarely see doing anything for the community and / or integrating is the Jewish community (nothing against them, just an observation).