Are pitbulls aggressive?
The answer to that is no. Here is a study that was done on the most aggressive dogs. The reason that big dogs get the bad wrap is because if a big dog were to bite a human most likely they would need stitches, however the small dogs cannot usually cause as much damage and it is just swept under the rug because they are little. This article about a study at University of Pennsylvania says that the number one most aggressive dog is the wiener dog(Dachshund), followed by the Chihuahua and Jack Russell.
The ASPCA(http://www.aspca.org/) has a few article that you can read about the pit bull, they talk about how they were tested and how they rated next to other dogs for aggression. They also talk about a search and rescue team on pit bulls that have saved many lives. There are trained police pit bull dogs, fire fighter dogs and even pit bulls that have protected our soldiers on the front line. I would strongly suggest thinking twice before judging such a loving breed.
Spay and neuter your pets to ensure that they do not have any built up frustration that might lead them to being short with another dog or a human. Pit bulls are very simple really. Give them the proper training and care and they will be a good dog, they are smart and eager to learn. They want to obey their owner. My pit bull thrived on the training classes we went through. She was actually excited to go in and learn sit, stay, down, ect. She was one of the best dogs in the class. Along with all of this make sure your pet gets enough exercise. If they are not getting the exercise that they need they have all this pent up energy that need to go somewhere and this can cause any dog to be destructive.