Governments are able to choose which nationalities are allowed entry via immigration policy.

Some might find criminal representation very relevant to that policy decision. Perhaps you do not. That’s certainly your prerogative. But outright denying the relevance is absurd.

If it turns out left handed people are significantly overrepresented in crime statistics, then yes, that would be interesting to know. Either something is wrong with the system or with left handed people. This notion of withholding information from voting adults just because it doesn't further a particular social engineering agenda is repulsive to be honest.

But we're discussing an article that specifically calls out the researchers ethnicity and the fact they are immigrants.

Or are you saying we should only talk about a person's ethnicity when it's in a positive light?

Maybe this article should have just said "a German husband-and-wife dream team"?