If we keep making mistakes without learning from them, especially making the same mistake again and again, we might end up in a big trouble some day which would be difficult to get out of. We need to correct our mistakes and ensure we don't repeat them.
Some people keep making mistakes and learn when they lose something big, some loss that irreparable. That should not happen, we should not regret our mistakes in a way that we regret them for life.
I agree with you, when you keep repeating the same mistake it can no longer be considered as a mistake. it is now a conscious act and it is assumed you know what you're doing.