Someone blackmailed Hunter & MADE him record everything
OR
Hunter knew he was being spied on/watched. He got to the "Fuck it" point
OR
He did not know his laptop was recording him & he always ALWAYS had his laptop open/turned on so he can be constantly visually stimulated while doing his crack. If he didn't, there would be a chance of a lull in avoiding thought & a vision of something terrible from his past would force his way into his minds eye. Can't let that happen.
Or. He's dumb.
I don't think he's dumb.