Perhaps the definition of the word 'theory' contributes to this:-
1. an explanation that has not been proved or tested.
2. the underlying ideas in art, science etc.
Many people use definition (1) in general speech but definition (2) would be used scientifically.
In general conversation I may say my WEIGHT is 82Kg but that is really my MASS. The gram is the standard unit of mass, weight is measured in Newtons. So for most JW's to understand scientific theories and concepts may be a problem due to WTS policy on education.
George