Everyone has theories, we need theories to get out of bed in the morning and perform anykind of activity whatsoever. Acts need intentions and intentions need concepts. For these concepts to be useable they need to be arranged into a conceptual framework, a view of reality, a theory. The problem is some idiots think their theories are facts rather than theories.
Unchallenged belief is usually a fatal condition however.
The larger and more complex the activity the greater is the need for theory. If we want to do absolutely nothing, and just lay back and vegetate of course we don't need theories. But any successful action needs good theory to make it possible. Theory is power. There could be attempted objections to this, a mystic might say they are following their own inner light.