East Boston gang fight ends with two arrests

I have known these two young men for many years and I can tell you without a shadow of a doubt that they are hard working kind hearted and great members of this community, they are both college graduates and help their mother with their dissabled younger brother. This incident came about both brothers protecting each other from the low life scum that have invaded the streets of East Boston..How come were these two outstanding young men the ones arrested and being charged with A&B when they were the ones attacked and one of them stabbed twice in the head and neck...why wasnt the individual that attacked them arrested was and is allowed to roam free and allowed to hurt other innocent people....they Police department needs to stop their false arrest and go after the ones whom are the real criminal and stick up for the honest and hard working people of this community