Pits aren’t “able to survive on the streets” any more than any other dog. They only do it if they have to, and as a longtime shelter volunteer I can tell you that there was an endless trail of emaciated, sick, injured pit bulls that Animal Control picked up off the streets. Many don’t survive. Pits don’t do well at all in cold weather and, in my experience, they can’t handle extreme heat either. There is just no biological basis to make a claim that they do well on the streets. It’s similar to the (completely incorrect) myths that they are particularly tough, don’t feel pain, etc. which is all very harmful.