Some people love to talk and be heard. They have a lot of thoughts, ideas and opinions and want to contribute in any shape, way or form to a discussion or subject matter, especially one that is within their interests. While that is all well and good, it is important to remember that giving an opinion or pointing out something is the easy part but the follow up to that which actually matters more but not many are willing to extend their goodwill that far. It all goes back to the intent of the person offering the opinion. If it is to help, then be helpful. Do not leave them in a confused and helpless state. That is just mean spirited.