Honestly in a mostly White or entirely White country devoid of Edomites would it matter? There's a point where you get so high trust that people will just do the right thing naturally without a need f...
But high trust doesn't just come from racial homogeny. Only certain races are capable, and racial homogeny isn't even necessary per se. I imagine a society made up of Whites and Japanese could be high trust for example. On the other hand, all black is still low trust.
1