the level of trust between people of the same ethnicity also fell off with increasing ethnic diversity.

It is more important for people to be good than it is for people to be happy. Goodness should be the goal - not happiness.
The problem with diversity today is that it is manufactured and coerced, not achieved williningly through means of commonalities. It focuses on differences instead of shared values. When this continues to be the case and we have racist systems like affirmitive action that breed cynicism and resentment, we have little hope for advancement.
The agenda of diversity is a materialistic sham and will never lead to acceptance, just division.
We must first ...

the level of trust between people of the same ethnicity also fell off with increasing ethnic diversity.

It is more important for people to be good than it is for people to be happy. Goodness should be the goal - not happiness.
The problem with diversity today is that it is manufactured and coerced, not achieved williningly through means of commonalities. It focuses on differences instead of shared values. When this continues to be the case and we have racist systems like affirmitive action that breed cynicism and resentment, we have little hope for advancement.
The agenda of diversity is a materialistic sham and will never lead to acceptance, just division.
We must first recognize what we share before the materialistic "theorists' try to "fix" everthing by dividing all mankind into specific groups and categories.

Of course when left to their own devices, people tend to drive away
those who are different. If you want to live in a bubble, go right
ahead, but don't cry when reality burst in, as it always does.

Of course, this is an initial response. However, as is proven in America, groups can come together easily when common values are shared. The agenda of those that separate causes the amplitude of the division and the frequency of the intoloerance. There is not a more diverse culture on Earth. I think a vast majority of Americans are proud of that fact. What we are not proud of are the opportunists, materialists, and bleeding hearts fabricating injustice and using our differences to ...

Of course when left to their own devices, people tend to drive away
those who are different. If you want to live in a bubble, go right
ahead, but don't cry when reality burst in, as it always does.

Of course, this is an initial response. However, as is proven in America, groups can come together easily when common values are shared. The agenda of those that separate causes the amplitude of the division and the frequency of the intoloerance. There is not a more diverse culture on Earth. I think a vast majority of Americans are proud of that fact. What we are not proud of are the opportunists, materialists, and bleeding hearts fabricating injustice and using our differences to divide us and create social programs that pretend to address whatever problems may exist. They almost always lead to more division.