Students stormed the football field at halftime at the Harvard-Yale game and held things up for about an hour, demanding that the schools divest holdings in fossil fuel investments. The disruptors were cheered on by presidential candidate Elizabeth Warren while actress Alyssa Milano decried wealthy universities "invested in the destruction of the planet." When you have important work to do like saving the planet, you certainly have a right -- it's assumed by these activists -- to violate the time and property of others as you wish. But these same environmental activists, who feel empowered to interrupt our personal and...