Review the Seven Commandments of Animalism Why do they change?

The Seven Commandments of Animal Farm are as follows: 1. Whatever goes upon two legs is an enemy 2. Whatever goes upon four legs, or has wings, is a friend 3. No animal shall wear clothes 4. No animal shall sleep in a bed 5. No animal shall drink alcohol 6. No animal shall kill any other animal 7. All animals are equal The commandments change over time to suit the needs of the greedy, power hungry leaders (Napoleon, Squeeler, etc). The saying goes 'Power corrupts, absolute power corrupts absolutely'. When the pigs discover the wonder of alcohol, they add in excess to the fifth commandment. When Napoleon discovers the comfort of a bed, the fourth commandment is changed to No animal shall sleep in a bed with sheets, and so on