I think if you take these parables literally, there probably isn't a single input that will reliably cause the mind to self-destruct, but they are a cautionary warning. The internet gives plenty of evidence to support the theory that memetic hazards (1) exist, (2) are more transmissible than widely believed and (3) repeated exposure will cause cognitive malfunction.
To share specific examples here would be irresponsible. But qualitatively speaking, one could argue that viral media are mild forms of memetic hazard propelling irrational, conspiratorial, or even extremist behavior in the real world. While the internet has many positive effects on our society, regardless of your political orientation, I think most would agree that instant, unfettered access to information can also lead to dysfunctional side-effects.
