Guy Sorman pays homage to Rose Friedman in this in memoriam. To summarize:
The Friedmans’ happiness thesis also incorporates their personal experience. Having lived long enough, they could compare various stages of American social life. They found that when the government encroached less on people’s lives, the country was safer. Americans behaved more responsibly and took more individual initiative. Rose and Milton were not waxing nostalgic: they were, above all, freedom fighters, dedicated to a better future for everyone.