The word “travel” is not in the Constitution. Neither is the word “bacon,” but we have a right to have bacon for breakfast, and to raise our children. This puzzles people who think rights are privileges — spaces of autonomy — granted by, and revocable by, government. Such thinking paves the road to what some seem to want: a permission society, where what is not explicitly permitted is implicitly forbidden, or at least contingent on the grace of government.