The act of editing existing footage to mask reality with non-reality is just that—the action of making something real less real. It can be used for filmmaking (and obviously often is), but it can be used for anything else too.

The issue is how easily these tools can (and will) enable the worst faith actors and actions. It's not controversial (or shocking) to think the current situation for deep-fakes or deceptive edits is historically awful. It's equally reasonable to think these tools are going to do less good for VFX houses in Hollywood, and more evil in authoritarian regimes or chaotic social media networks. You're right that the Overton window has moved—but we ought to blame a White House that disseminates deepfakes, not commenters on HackerNews.

Tools aren't just tools, nothing exists in a vacuum. A plane is a useful means of transportation, but that doesn't mean everyone should be rushing into the cockpit. It's pretty plain to me how a tool that streamlines doctoring footage to such a useful (and deceptive) degree is just a recipe for disaster. Considering the benefit to society is...slightly eased CGI work (?), I'll easily label this a net-negative for us all.