Aggressive breeds aloud without muzzels

I stayed for 3 months, the place was lovely. But there is something very important to me I have a very docile golden retriever poodle. While I was there there was many pitbulls without muzzle witnessed a pitbull get loose from its owner and attacked two small dogs the dogs had to go to the veterinarian hospital I had to take my dog and pick him up and run and hide this happened right in front of me it was horrible. I don't know the fate of the other dogs but one couldn't walk. The man that was walking the Pitbull lost control of it because the Pitbull wanted to attack the other dogs in the park he slipped right out of his collar. I believe they shouldn't allow aggressive breeds and if they do they should be muzzled until then I would never come back here I love my dog I can't imagine the situation if it would have been my dog it scares me just the thought