This is a forum in which we try not to be too obsessive about the rules that have been created to help the forum run smoothly. However, we have limited time at our disposal, and most of us agree that opening a thread to find that it says only "Thank you" or "I agree" can be frustrating. This is why you'll find the 'Simply click on the like button' appears every day, often several times. Our hope is that the message will eventually sink in, as it usually does for our regular visitors.
We moderators do our best to observe the rules as well as remind others of them. If we occasionally make a slip ourselves, or if, through lack of time mainly, we don't always remind people of the rules, then that is simply a reminder that we are all human. We do hope that at least our regular members make some effort to follow our guidelines.