Neither is passion. It just isn't so. In fact if you have strong feelings, and you post with the pretense that you're not passionate you just create the illusion of objectivity of detachment. As if it's the voice of pure reason alone guiding you to your conclusions. I'm not talking about insults or ad hominem attacks.
Good debate is direct.
It doesn't avoid or ignore or walk with trepidation. This isn't just a matter of the objectivity of science. I grew up among scientists. Half my family are scientists - and they are opinionated and passionate and they will argue that way. They will not think twice about saying what they mean.