This year on the 4th of July, my husband and I took our kids to see the fireworks show by our neighborhood lake. It was in a park where 5,000 people peacefully sat in the dark and watched pretty flowers explode in the sky. As sweet as it was to see kids and teenagers running around on a warm summer night, I couldn’t help but think of the people in Nice, France a few years ago. That crowd had also gathered to watch fireworks for their independence day, but their…