Changing your opinion on any subject matter is normal.
As a society I feel like everyone has a need to be right all the time and do not really take a chance to listen to each other as we should.
With that being said you can change your mind, your opinion, etc after given more information on the subject matter.
The important part is not to be right all the time but to learn and become more knowledgeable each day.
We should try and become better people every day and that is a way to do it.
The focus should be on learning, understanding and listening to each other. Pride should be out of the window.
Pride does not get us anywhere and causes many of the problems in society today.