I haven't seen any evidence to indicate that pitbulls have a worse temperament than other dogs, however their physical ability to do damage is self-evident. I don't judge pit owners, but I'd personally never get a dog whose ass I couldn't kick.
This seems like solid common sense to me. Combining kids with dogs can be a risky thing. When my youngest was 3 he took a flying leap off a couch and landed on a sleeping dog - I don't know what it was, it looked like a smallish German Shepherd. Know what the dog did? Acted like a dog and bit. Couple of snaps and then backed right off. My son had to get stitches on his face.
I do not blame the dog in that situation. Nor do I blame the owners. If anything, I blame myself for allowing my son to get into a situation where he was able to drop four feet onto a dog. The outcome is that he has much more respect for animals, but he didn't gain fear of them (miraculously). All in all, it is a good result from this. He played with the very same dog the next day.
Now, imagine that he had done the same, and landed on a pit bull. The strength of the jaws, the weight of the dog, and whatever training it had would have done so much more damage to my son, no question. That is not the right situation in which to insert a muscular, powerful dog. I don't care how much you watch your children, or how well you teach them to respect animals and all that, two and three year old kids test the limits of pets patience. Having a pit bull when you have a toddler is more dangerous than having a Pomeranian when you have a toddler, that's just plain true.
Does that make it inherently bad to have a pit bull? Well, decide for yourself, folks. My kids are old enough now that they can be trusted to not take flying leaps, so, if I were a dog person, I might consider having a pit bull in the house, except for the fact that many of our friends who visit have two and three year old kids. So, still, no. I wouldn't do it.
There's a place for pit bulls. Those places should probably not overlap with places where young children roam free.
But that's just my $0.02
Did you folks know that pit bulls are now illegal in Ontario? Crazy.