When the
"laws" on the wall keep on being changed, all the other animals
except the pig never question why that happens even though they know that
something different being put up there originally.
Also no one seem to remember that strength in numbers is what
got rid of the farmer in the first place, and this idea could also get rid of
the tyranny of the pigs. However they were too ignorant to perceive that the pigs were oppressing
them and trying to brain wash them.