The difference being that humans aren't computers and can deal with an attack like that by deciding some sources are trustworthy and sticking to those. If that

The difference being that humans aren't computers and can deal with an attack like that by deciding some sources are trustworthy and sticking to those. If that slows down fact-determination, so be it. We've been skirting the edge of deciding things were fact on insufficient data for years anyway. It's high time some forcing function came along to make people put some work in.