Well i totaly don't agree with you here my friend, changing your opinioin is totaly normal and acceptable even if one changes his opinion in a few seconds, because an opinion is not always based on our believes, many times we rush to throw and say our opinion without much thinking and analysing the situation which is the most common case, for example if we forget an information or we have a wrong one about some matter or we didn't exacly understand what the other side is trying to say, so our judgment or our opinion wouldn't something to stand behind because and in a simple word its weak or wrong and if someone knows he is wrong on some matter and still stick to it so he is not stubborn but he is ignorant for sure, so changing an opinion does'nt mean i'm weak and i can't stand behind my words, we can see it as i'm strong i admit when i'm wrong and this or that what i should have said, so as soon as i discover that my comment was wrong or i could tell my point in a better way i'll edit it or erase it totally