Economics is a value-free science, in that it analyses real-life processes and policy implications _without_ prescribing what specific goals are to be pursued by the policy makers.
Politics (unlike _political science_, arguably) is all about promoting specific values and fulfilling special interests. It's not necessarily "bad", it is just not what economics is about. Economics provides the tools for analyzing what _means_ are appropriate (or not) for attaining some or other ends, but the latter lie outside of the scope of economics as a science.
I wish this distinction was so hard and true. It has unfortunately been my experience that to address the assumptions of most economic thinkers, political engagement is required. Bringing up heterodox or marxist _economic_ arguments tends to be met with political resistance. I will redouble my efforts to keep the distinction alive.
Politics (unlike _political science_, arguably) is all about promoting specific values and fulfilling special interests. It's not necessarily "bad", it is just not what economics is about. Economics provides the tools for analyzing what _means_ are appropriate (or not) for attaining some or other ends, but the latter lie outside of the scope of economics as a science.