Thats one country out of ten that the game models though
Its REALLY important that the effects in the game work equally over all nations, otherwise it gets unplayable and deeply confusing. For the example given, where its assumed people in ethnic minorities are poorer, that may be true in the US< but is there similar evidence in Spain? in South Korea? This is where it gets complex.
Ideally the US would be modeled in such a way that (due to historic issues of racism), the income of ethnic minorities was lower than others, which would naturally then push a lot of those people into the ‘poor’ group. But thats a different way to handle it. The effects of this policy must only reflect the direct effects, Anything that arises because ‘people in group A tend to be in group B’ needs to be addressed separately, by per-country adjustments to make that connection.
FWIW the USA has a special override in the game for the history of slavery/racism which makes racial tension in the US higher. Perhaps there should be a corresponding knock to the income of ethnic minorities in the UK? (and perhaps in other countries too?)