With respect, naive
use of the word "fact" implies that "reality" is independent of the existence or actions of "observers". At a deeper level, the etymology of the word "fact" is from the Latin facere
(to construct), from which we can argue that "theories based on facts" are agreed constructions
of observers working within a mutual self consistent paradigm. Thus, for example, what were considered"facts" about the "humours of the body" in the Middles ages, have in recent times been deconstructed/reconstructed in terms modern "physiological" paradigms. In short a theory involves the perception of "reality" through a particular set of selective spectacles which covertly define what constitutes "facts".