This is like saying food makes us fat, ban food! Nonsensical
If we're to use logic, how about use it properly? For one, food is essential for our survival. Powerpoint is not. So while banning food would be nonsensical (for that reason), banning Powerpoint doesn't have the same issue. A better example would be: "French fries make us fat, ban french fries". Not as nonsensical. French fries are not essential to eat in the first place, and cause harm according to most studies.
I think you made GP's point better than he did. Banning the medium and hoping that fixes the root issue is a bit foolish. Not to say banning the medium isn't always a bad idea, but doesn't mean it'll help.