I haven't read the paper either, but I must say the operation of parasites as elements in complex biological super-systems is absolutely fascinating. Ants that march to the top of trees under the influence of fungus spores trying to be eaten by birds. Fish that commit suicide by swimming toward predators as part of a parasitic lifecycle.... evolution is truly miraculous.

Another apocryphal story is cats carrying Toxoplasma Gondii make some people really like cats. So maybe mad cat lady syndrome is treatable with drugs :)

Who knows what super-systems we are unwittingly a part of. That seems an interesting area for big-data + AI hypothesis synthesis - we may find new explanations or even whole new branches of behaviour in psychology.