Why don’t interviewers call out guests for dodging questions?

Whenever I watch a news interview — especially with politicians or public figures — I notice how often someone gives a vague or completely unrelated answer, and the interviewer just moves on.

Why doesn’t the interviewer ever say something like, “You didn’t answer the question,” and then re-ask it? Wouldn’t that be the most honest way to handle it?

I see this not only in politics but also in entertainment and other public interviews. Is it because interviewers risk losing access if they push too hard? Or is there some unspoken rule of professionalism that prevents them from openly challenging a guest’s evasive response?