The implications of post modern skepticism on values and power

If you want to act on your beliefs and use them to empower yourself, you may feel disconnected from reality. The post-modern scepticism argues that values are subjective and cannot be objectively grounded. This leads to relativism, where each person has their own value framework. Without objective grounding, it becomes a power struggle between individuals. The post-moderns, influenced by Marxism, have stripped power of any moral significance. But what's the motivation for this?