"I think everybody should like everybody"

I find it almost humorous how upset people get about people who have different opinions than they do. My time as a social studies teacher seems to remind me that one of the many different reasons why our country was founded was so that people COULD have a place to create their own opinions, especially when it came to religious opinions. Yet, here we are fighting because our opinions are different? I understand the desire to seek the truth, but I can't help but think maybe there's a reason why people interpret the Bible differently. Don't you think that if God had wanted us to all think and believe the same way he would have left less shades of gray?