Pray, not because people are doing it, but because it's the least you could do for all those who are affected. Pray for everyone. God listens, God cares.
When we pray, we should pray for everyone, because everyone will need prayer at a certain point in time. Just as those who experienced major natural earth disasters in Japan weren't expecting for what took place to happen, people all around the world experience devastating life disasters as well daily. So don't be scared to pray.