I think you mistake an indicator for an indicated. A theory tends to be widely accepted because it is the best explanation for evidence. If something is a the

I think you mistake an indicator for an indicated. A theory tends to be widely accepted because it is the best explanation for evidence. If something is a theory just because it is widely accepted, then that would make the idea that "lifting our arms is hard due to gravity" a theory, whereas the correct view is merely an idea that experts believe is correct.