hmm not so reassuring...
Not to mention the fact that people seem to live on fine with domestic cats for the last 2,000 years, with no casualties...
But seriously, the claim wasn't that the parasite immediately kills people but makes them more disposed towards self-destructive behavior. The fact that, 2000 years after people started living with cats, humanity yet survives isn't really absolute proof to the contrary.
Imagine how different life would have been now without that crazy infected folk who like dangerous driving and become obsessed with insane ideas. =)
By the way, can anyone clarify—is there a way to detect toxoplasmosis even in latent form? It seems from Wikipedia article that blood tests can't provide reliable results here.