The research results produced within science with their potential use are the products of science that sell, and the goods from science that have a market. It is the appreciated public side and life of science. To produce the knowledge sought for, science needs assumptions about the reality under investigation. Providing such assumptions is the role of theory. The problem is, that the theories themselves rest upon assumptions, and these assumptions are all to often taken for granted, not because they are proven to be true, but because they are only believed to be true.
Any researcher has to stick to a theory to accomplish the tasks of research.
It seems reasonable to assume that scientists doing research are confident about the theories they use. They choose according to the preferences given by their general beliefs about the world. Sometimes these beliefs are much elaborated and turned into theories, sometimes into ideologies. In these cases they are open for discussion, but once this has happened, the real basic beliefs have taken a step backwards, viz. To me it seems important to discuss these matters, and to do that in recognition of their status of basic beliefs, not theory.