Robert Putnam -- famous for "Bowling Alone," ... found that the greater the diversity in a community, the fewer people vote and the less they volunteer, the less they give to charity and work on community projects.... virtually all measures of civic health are lower in more diverse settings... "Diversity... seems to bring out the turtle in all of …

"Switzerland, Iceland, Denmark and Norway are the world's happiest countries, according to the 2015 World Happiness Report, ... Bringing countries together in a big bloc such as the EU doesn't help increase social capital. And when some countries in such a union do worse than others, their social fabric rips in a dramatic way, trust erodes and th…