Anyone who has ever owned a Pitbull please help me understand if I should have legitimate fears?

I consider myself a fairly open minded, intelligent girl, I also consider myself a chronic worrier and a bit neurotic at times, which brings me to my problem. I am an animal lover to the core, currently have 4 dogs, 2 cats & a 22 month old son, as of yesterday I am also now the proud foster parent of a rescued purebred Pitbull puppy estimated at 5 weeks old, his demise was to be by way of being the bait dog for the 2 upcoming star fighting adults. So I try really hard not to be a hypocrite or self righteous but having this Pit has made me realize that I may actually fear the dog that I have worked so hard to inform people about. As never having one or being in a home for any period of time who has had one I fear for my sons safety first & my other pets second. I cannot believe that I am going to falter on what I stand for but I have to be honest & say that I am a little nervous what this dog may turn into in the preceding months to come while the owner is brought up on charges.