Gene Slater, a long-time advisor on housing for federal, state, and local agencies and the author of “Freedom to Discriminate: How Realtors Conspired to Segregate Housing and Divide America,” discusses the outsized historical influence of California’s real estate industry. It helped set the stage for many of today’s social problems, including homelessness, housing shortages, racial and educational inequality, and the prizing of personal freedom over what’s best for the community.