The trouble with being sheep in a caste system is that you are born into a flock, and that is where you will spend your entire existence, defined by its limits. Since this provides automatic success and certain security for some castes, there will be a tendency of these to create a caste system wherever they are able, and it is usually the people whose caste wields wealth and other forms of power that would prefer to make that the system of order.
The trouble with being sheep in a caste system is that you are born into a flock, and that is where you will spend your entire existence, defined by its limits. Since this provides automatic success and certain security for some castes, there will be a tendency of these to create a caste system wherever they are able, and it is usually the people whose caste wields wealth and other forms of power that would prefer to make that the system of order.