Cultures are not monolithic, static entities. How do we go from "different cultures" to "negative outcomes?" That's a complete non-sequiter.
Imagine if all of Germany moved to India. What would happen? What if part of Britain moved to UK? At some point the politicians will have to look at the issue...
> During the 2015–2016 celebrations of New Year's Eve in Germany, approximately 1,200 women were reported to have been sexually assaulted, especially in the city of Cologne. In many of the incidents, while these women were in public spaces, they were surrounded and assaulted by large groups of men who were identified by officials as Arab or North African men.
https://en.wikipedia.org/wiki/2015%E2%80%9316_New_Year%27s_E...
> imagine if all of India moved to Germany. What would happen?
Indian & East-Asian immigrants have much lower violence stats than the native populations. To that end, your example doesn't say much about the GP that you're replying to.
To steel man the GP, let's say they mean any 2 demographics, not German vs Indians specifically. But there in lies the core issue with immigrant conversations. You can't pick 'any 2 demographics'.
Different immigrant groups (grouped by nation/age/gender/religion/skill-level) demonstrate different integration characterisitics. All immigrant conversations should be painfully specific. The conversations will be politically insensitive. But this is a comment thread about Trump winning his 2nd term in office. So, clearly, the ship has already sailed on political correctness.