Each time events such as what happened in Paris over the past week occur, Americans react predictably. They scream anti-Muslim insults at public events, they harass Arab Americans, and they demand we lock down our borders. Ignorance is a big contributor to these reactions, but fear is the primary cause. Some Americans are fond of the phrase "freedom isn't free" but seem to misunderstand its true meaning and are often the first and loudest to call for taking freedoms away. "Freedom isn't free" means that sometimes, if you want to retain your freedom and the freedom of others, you have to be willing to accept a little uncertainty, a little risk, and yes, a little fear.