Again, Nature and Nurture....
You can socialize and nurture a Great White Shark perfectly for it to be a secure and gentle animal, its still going to attack any prey it sees and tear it apart....
Correct me if I'm wrong, Siegfried and Roy had a reputation for treating their Tigers wonderfully, yet one show a Tiger decided to chomp down on Roy's throat....
Most dogs that are nurtured well, will be gentle animals that can be trusted....
But from what I have seen, the problem with Pit Bulls.....
Even those that are nurtured perfectly, still have a natural killer instinct that can come up....
I totally get the shame in all of this, there are plenty of wonderful, loving Pit Bulls that will go their entire life with never hurting anyone, that are maligned and not trusted because of a few owners or a few pit bulls but that is the facts....
Like I said before, a Friend of my Daughters, had a perfectly raised pit bull, a record of gentleness the entire dogs life, turned around a saw half of her baby in her dogs mouth, the other half on the other side of the room....
For me, even if its only a 0.1% chance the dogs bred traits might surface despite perfect nurturing, that a 100 times too high around children, IMO.