For a start, please read the thread on here "I think my dog is pg" (or similar, I may have paraphrased).
Then take it from me, a rescuer with kids who had a SBT X in the home from the day they were born and who has fostered SBTs amongst others, a well trained, loved and cared for dog is just that, regardless of his breed. Same with people really. Huntley was a man who murdered two children but does that stop you getting into bed with your DH at night just because he's a man? (Sorry if you're single or not straight but you get my point I hope!).
Have a word with rescue, all types, not just the big ones but nationally rehoming independents and local small ones too. meet their dogs and hear it from the experts.
ANY dog can be aggressive. There are several SBTs in the rescue I help out at and do you know what? They are all terribly affectionate... but one of the rescue's Jack Russells is a little bugger and has been known to snap.
Think too about those of us who DO or HAVE owned SBTs and who have children. Do you honestly think we'd have a dog which was untrustworthy around our kids?
What you read in the papers are the rare, very rare in fact, terrible cases - recent cases over the past years have often been those where the dog is not properly treated or not in the care of the actual owner but grandparents.
Did you not read about me and my SBT x and foster Staffie in the Telegraph, Mail and Sun?
No... you wouldn't, because like thousands of other families who own or foster SBTs NOTHING BAD HAS HAPPENED! And nothing bad happening doesn't make the newspapers!
Seriously, go chat with an independent no kill rescue which homechecks (for YOUR sake as much as the dogs, to get the right match), vaccinates, chips, neuters and offers lifetime support and which will take the dog back at any stage in his life if you can't keep him. Let the experts guide you. :)