I think rigid opinions can be a virtue if the opinion is of high morality while everybody else's isn't. Refusing to cooperate in a crime when everyone around you wishes for it (for example, looting during a revolution because everybody already does) would have to be rigid so as to not let you fall under the "majority tsunami". Hell, starting a revolution because you believe the current regime to be oppresive and incapable of change on its own would require a rigid opinion to begin with. There's nothing to learn in both situations, but there's something to lose or miss out on. Would conforming be a virtue, then? I don't believe so: uncomfortable as it might be, you have to persevere for what you believe is right.I don't think having rigid opinions is a virtue because realistically there will always be something else we can learn. Having rigid opinions stops growth.