1. a branch of knowledge or study dealing with a body of facts or truths systematically arranged and showing the operation of general laws: the mathematical sciences.
Please list a set of economic truths. Any set will be good enough as long as it can make reliable predictions that can be tested in the real world.
> You can use any science to wrap up political decisions.
You could, but the point is not to. Or if you want to then make sure that the science is predictive.
> Be more specific. Who said what?
When you are talking about the general facts that economics is often prescriptive but at the same time can be shown to be unpredictive which proves that it is not fit for this task. Yet economists and their political allies continue to argue that it is. Maybe it's better than simply political arguments and maybe the justification for supporting the orthodoxy is in line with that. That you're scared of the political outcome and so economics is a safer option.