Sometimes, an unexpected experience can change the way people see important issues. Country music singer Caleb Keeter had been an opponent of gun control, he wrote on Twitter. That changed on October 1, when 58 were killed and over 500 injured at a country music festival in Las Vegas where Keeter performed. I cannot express how wrong I was, Keeter tweeted. We need gun control RIGHT NOW. My biggest regret is that I stubbornly didn’t realize it until my brothers on the road and myself were threatened by it. Keeter is not alone. Other people also became strong supporters of gun control after experiencing gun violence. Others changed their opinions on health care policy after getting sick. And a Republican senator dropped his opposition to same-sex marriage after learning his own son is gay.