When 3 million people march to "defy terror," I think it's safe to say that there will be no impact on terrorism. You don't hold political rallies to deal with a threat like that.
Let me know when 3 million people ... or even 3 people ... march in Paris over their God-given right to keep and bear arms. If they had been doing that last year, there might have been no reason to hold a rally to "defy terror" this year.
The only place I want the President of the United States to “show up” is at the American governor’s palace in Riyadh to receive tribute from the former king of Saudi Arabia, before he flies to Islamabad to visit the Indian Commander-in-Chief, Former Pakistan Region.