I want to believe it because it makes a great science story and it makes good reading but who knows? This meta analysis only shows there is some correlation with behavior changes (only schizophrenia seems to consistently have some correlation) and discusses the difficulties in doing studies in pretty easy to understand way IMHO, https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8548174/ The very high 30 percent infection rate among the world population is kind of like like herpes, which at first thought would seem to confound things, though at a glance at a few, the studies were careful to separate infected versus non-infected.

Hmm, it seems there are two different Toxoplasmosis/Accident narratives floating around out there: (1) That infection causes risky behavior and (2) that infection harms reaction-times so that accidents are more-likely or more-severe.

I suppose both could be true, but isolating the effect(s) means different kinds of studies.

I remember reading about it, probably in a farming related book from the nineties.