I think it's ridiculous. Cats don't kill babies and the people who go on about it to women as soon as there is a pink stripe on a test strip need to be taken outside and gently corrected with a baseball bat have their foolish misconceptions pointed out to them.
If somebody is concerned about toxoplasmosis, they can have a blood test to see whether they've ever come into contact with it.
I grew up in a fucking midden surrounded by unvaccinated/untreated animals, cats, dogs, rabbits, foxes, hamsters, assorted wildlife, visiting strays, etc, and was generally brought up on the floor with the beasties and all their parasites. I still hadn't ever came into contact with it.
As regards scratching, I imagine that I learned very quickly not to piss cats off - I know I would have been told 'serves you right' if I had hurt one of the animals, but I cannot remember ever being scratched or lashed out at - presumably I learned so young that it never happened when I was old enough to remember it.
My own pets have always been handled daily whenever I felt like it to teach them it's OK to be touched (I encouraged the OH to do the same with them when he moved in - he was used to farm cats who definitely don't approve of such things - and farm dogs that certainly weren't pets) - and they have never lashed out.
Cats have taken advantage of lived with humans for tens of thousands of years. If they genuinely killed babies, they wouldn't have made it through the first hundred without being exterminated. We haven't even done much to change their temperament, size or appearance (other than a few cosmetic changes) - because we haven't needed to. If they were dangerous to children, they'd be genetically separated into 'Toy Breeds' and 'Working Breeds' like we've done with dogs; they're fine as they are and have always been.