As Mr. Lucas works his way down the freeway through Marin County’s rush-hour traffic at the wheel of his top-of-the-line dark green BMW, his children in the back seat sing along to pop hits playing on the radio. “There’s no one I admire more than single mothers, because they are the real heroes,” Mr. Lucas tells me cheerfully. “Children are the whole point of life. Even as I was getting divorced, I decided that taking care of the kids was the most important thing I could do. You have to open yourself up to it, but I don’t think there is any greater spiritual joy.”