Let me whip out the crayons for you then....
You didn't answer any of the questions, though they were rhetorical to show how incredibly nonsensical it all was.
Here, let me help you.
They shouldn't need to constantly repeat a pledge, as a pledge is a long lasting commitment. Which explains number two. It's obvious children don't understand what a pledge is, nor could they be expected to honor said pledge. Which is why they are told to repeat it constantly, indoctrination! Which brings us to the first question. I think we all know the basics, but the most important factor is that it's done knowingly, and willingly. In the case of the pledge of allegiance, the children neither have the knowledge of what they are doing, nor the choice. They are commanded to perform the task without even knowing what they are doing.
Now, this is logic! Ignorantly continuing on with a tradition for tradition's sake is practically the exact opposite of logic.