"YANBU. If you want a dog, why choose an intimidating one?"
They aren't intimidating.
All dogs have the potential to be viscious if they aren't trained well, even a tiny little handbag type dog.
Unfortunately Staffies, since the DDA, have been chosen by too many bad owners looking for a status dog. Hence why so many end up in rescues, they are badly treated (you think the kind of person who wants their dog to act scary, achieves it by treating the dog well?), they've also been given this awful stigma.
All the Staffies I've met have been sweet as anything - even the one walked by the local chavs! (Even ignores our dog when he's snarling and barking at the staffy) Our next dog will be a staffie, it breaks my heart seeing them left in rescues year after year.
I can understand your fear OP, but you'd be best off not picking your children up unless the dog is actually coming at them.
Also, what a dog is traditionally bred for doesn't necessarily translate under a good owner. My dog is traditionally trained to chase birds and small animals - bar squirrels he couldn't care less.