Yes, up to a point. There are normative rules of discourse and their violation is considered incompatible with the goals of dialogue. Extreme rudeness, insults, evasions, stuff like that are generally not desirable. Hey dream, what's the word count for that page? What part(s) are you referring to? People are ultimately unknowable. On the other hand, considering the fact that criminals are convicted based on what the legal system understands about their intentions, the notion of assessing of what's going on in people's minds is pretty obviously has legal legitimacy. And then there's psychological science.