Sean Adler, 48, Thousand Oaks mass shooting victim, recently opened his dream business
The grand opening of Sean Adler’s Simi Valley coffeehouse, Rivalry Roasters, had taken place less than three weeks earlier. Tucked into a strip mall, the small shop was a dream of Adler’s, one he worked tirelessly to pursue after a heart attack kept him from a future as a sheriff’s deputy. But on Thursday, bouquets…