I quote a portion from one of the above links:
Each varna and ashram has its own specified dharma. What may be desirable for one section of society may be degrading for another. For example, absolute non-violence, which includes refraining from animal sacrifice, is essential for the priestly class but considered wholly unworthy of a kshatriya (warrior). Generating wealth and producing children are essential for householders, but intimate contact with money and women is spiritually suicidal for the renunciate. Underlying all these apparent differences is the common goal of advancing in spiritual life based on sanatana-dharma. Without the spiritual equality and sense of service inherent in sanatana­dharma, varnashrama-dharma tends to degrade into the rigid and exploitative caste system.