Tommy, pit bulls are more dangerous. Arguing otherwise it's just flatly retarded and makes people dismiss EVERYTHING you have to say. Argue your case with intelligence, man! You can't change the facts. Statistics show beyond any doubt that pit bulls are more dangerous than almost any other breed of dog. Arguing that by sheer coincidence all those pit bulls just happened to have a ---smurfy--- upbringing is absurd. You will never, ever convince people that pit bulls are not more dangerous when you have objective facts that prove otherwise.
Pointing to your well behaved dogs doesn't change anything. That's what is known as anecdotal evidence. If the argument people were making is that all pit bulls are deadly dangerous all the time and want nothing but to eat babies every second of the day, then yeah, you could point to your pit bulls and say, "Nope . . . mine have eaten very few babies, and only on special occasions." But that's not the argument you have to deal with, so that won't work. The argument you have to deal with is that pit bulls attack and kill people much more often than other breeds of dogs. It is an incontrovertible fact. They just do. If you want to be successful you need to deal with that fact sensibly, not insist that it doesn't exist, because the people you are arguing with happen to know that it does, in fact, exist.
Stop pretending that pit bulls are no more dangerous than other kinds of dogs and start pointing out that sports cars are more dangerous than sedans, yet we don't ban sports cars. Swords are more dangerous than knives (all things being equal) but we don't ban swords. Football is more dangerous than Tennis, but we don't ban football. Beer (especially 3.2 beer) is less dangerous than liquor but we don't ban liquor. The mere fact that less dangerous alternatives exist does not automatically justify a ban of the more dangerous item. There are other factors that need to be looked at. How dangerous is it objectively? Is it really a major problem in terms of the number of attacks, or is it just a well reported problem, i.e., are a relatively small number of attacks every year getting blown out of proportion and painting a picture that is far far worse than reality? Even if it turns out that the numbers show that there is a serious problem, is it something that could be dealt with through sensible regulation as opposed to an outright ban that would hurt hundreds or thousands of responsible pit bull owners?
It's not like your side has no good arguments, but you're ignoring them completely in favor of a extreme position that is simply insupportable. It makes you sound like Xiaou2. Even if you have good things to say, your audience is blinded by your lunacy and extremism and refusal to accept the reality of the situation.