As another brand new account, I could see why you'd say that. But in practice, our understanding of what people say is rooted in who they are.

If somebody wants to write a book making a formal, evidence backed argument on something, I'm less concerned with who they are. But when somebody jumps into a discussion with a few sentences, asking who they are and what their motivations are is much more reasonable. Especially on a topic where, as with this one, billions of dollars are on the line.

There are now plenty of people whose whole job is to argue a party line that may have no relation to the truth or to what the speaker believes. There's literally no point in having a serious discussion with, say, a tobacco company PR rep, because they are paid to mislead people forever, to never be convinced, and to distort the dialog as long as possible. With somebody like that, treating them like an honest interlocutor is not only a waste of time, but I believe it actively harms the discussion.