How does the 'I know' bit advance the discussion?

At some point, it's silly to expect every comment to make a full and comprehensive argument. Like how I can worry about something falling from the sky because "I know" gravity exists. So when I see something straight above your head growing larger coming straight towards you as it falls, I know it will not change course, and I don't feel the need to explain general relativity to you before I suggest you ought to get out of the way.

The discussion isn't about whether we know it's happening or not. We should stop letting deniers move the goal posts.

The discussion is we know this is happening, what do we do to stop it?

I don't understand what you mean by "advance the discussion."