Answer:
The most likely of Orwell's purpose for writing this passage is to illustrate the power struggle that Napoleon will likely win.
In clear defiance and demonstration of power Napoleon urinated on Snowball´s windmill plans. This is to show Napoleon´s ways in dealing with his opponents. Far removed from a statesman, Napoleon resorted to trampling on the other´s ideas, quite foreboding of what was to come.
Explanation:
Basically until you understand yourself and you truly know who you are and what you believe you'll always be know as what other people think about you, because what they say will matter more than what you believe yourself
A central idea of a text is the author's overall idea that is presented throughout the text that is thoroughly supported.