Intimidating?

I get annoyed when these groups of pure breed owners meet and congregate at the dog park. I'm especially peeved when their dogs are aggressive such as these bulldogs. They are constantly getting into scuffles with other dogs and you can hear it all over the 11 acre park. Why would you bring a dog you can't let off lease to a dog park where dogs run free? I say you do it to intimidate other dogs and their owners. Sure I am a bit cynical but...