In science, we come up with concepts and then name them (ball hits wall = force). We then find other phenomena that match those definitions using objective criteria (does car hit pole = force? yes, so it's force).

In politics, we come up with terms and associate feelings to them through classical conditioning (dictator = bad, dictator = bad,...). We then find phenomena that affects us in beneficial or harmful ways (Chinese leader is good for New Zealand economy), then label them based on how we want others to feel about it (China leader ≠ dictator/bad).