I'm sure many of those links are in tandem with the title, but you have to at least vet them a bit:

For example, a quote from the study you summarized as Ethnic diversity reduces happiness and quality of life says:

Trust (even of one's own race) is lower, altruism and community cooperation rarer, friends fewer. In the long run, however, successful immigrant societies have overcome such fragmentation by creating new, cross‐cutting forms of social solidarity and more encompassing identities.

If you want to convince onlookers on the fence in a debate with leftists, they'll tear you apart for at least somewhat misrepresenting that study.