Have mass shootings now become routine tragedies in America? A country in pain is asking questions: Is the President saying and doing enough, and did he contribute to these tragedies? Did others contribute also, and if so, who and how? Is “American Nationalism” the problem or “white supremacy,” and what’s the difference? Who are these angry, armed kids and why have mass shootings erupted into an epidemic? Are this past weekend’s horrible tragedies enough to compel real change and if so, what? Everybody says we “have to do something” but what would have stopped these shootings and will the reforms being discussed now work better than those we’ve already tried? Supremacist V. Nationalist: What is the difference? ABC News Political Analyst Alex Castellanos discusses with Tony Cruise.