Big-ticket litigation is becoming a way of life in this country. But something new is afoot-something typified by the $246 billion tobacco settlement, and by other courtroom assaults against companies producing guns, cars, breast implants, asbestos, lead paint, and more. Each massive class-action suit seeks to invent new law, to ban, tax, or regulate something that elected lawmakers had chosen to leave alone. And each time the new attack process works...