Rottweilers do have the right to roam and the community does nothing

Following the attack from a Rottweiler dog I've followed up with one of the four dog wardens from Tower Hamlets to find out why nothing is being done to protect the community. The conclusions were alarming and I feel less safe than ever. According to the warden there is in fact no protection against Rottweiler and they do not have to be muzzled or even kept on leashes. And it does not matter how big they are. The only protection is once the dog has already bitten you and shown itself to be aggressive, only a few can then find the owner may they be prosecuted. By then it is a bit late I think! The only place where you are safe is if you are by the highway, on the side of the road then a dog must be on a leash. However under this rule anywhere which is thought to be leisure for example the park, the riverside walk or communal areas in estates are just not safe! Also there seems like extrajudicial areas are not even covered by the community's power and in the area where I was attacked in King Edward's Memorial Park this is a legal black hole where it is not even patrolled, dogs can do what they want and owners will not be pursued. Apparently it's a legal minefield for the dog wardens and even they admit there is not enough protection, so they remain toothless tigers.
So what do the dog wardens actually do? Their main role is to pursue those dogs which have fouled, but that's foul play considering only four people have been fined!