Why have park rules?

I have been going to Bear Creek Dog Park for 6 years and will not go back again. The patrons of the park have discovered there is no regulation of the park rules. Lately everytime I have gone to the park someone with a large dog or dogs rationalize that they are special and are above the rules of the small dog area. When asked politely to follow the rules they adamently refuse. I am saddened by this, it used to be a great place.