I think ultimately it is important to change things up. Not meaning that if you are a vegan, you need to become a butcher (of humanely raised meats no doubt). Or if you are straight edge, you need to party with Gang Green (is there an ethical equivalent here...?)
But if you are set in your beliefs, then it is prudent to take the time to listen to differing opinions. If only to strengthen your stance.
Especially if what you believe is the truth.