Natural Justice Tweaked

It begins with me in New Hampshire driving with my partner, and a new rookie, to a house where we got a tip about a serial killer. We drive along a dirt road towards the house, and once we get close we can see that there is also an outhouse not far from the main building. It is a rustic looking white house with a screen door. For some strange reason I get a foreboding feeling. We walk to the door and knock expecting someone to answer. Instead the door swings open; I draw my weapon and enter the house to find a trail of blood leading to a back room. I pass through a living room; two lamps, a forest motif couch and matching chair facing an old TV with bunny ears. The kitchen is simple; a single stove next to a sink. A small square table sits in the center with two half-eaten cereal bowls on it. I hurry into the sleeping area, where I stop instantly, from wall to wall is gore. He chopped the family to pieces. Holding back my vomit, I retreat to where my partner is waiting with the rookie.
Bullets zing by us from the direction of the road; dodging towards the car I can make out the shape of a 5'6 white male, bald head, pale skin (for anyone who knows he looks like Mark Theriault. We fire back towards him but the distance is too great for my SIG. He tosses the gun away because all his bullets are spent, and runs down the road towards town. My partner races after him on foot; so I grab the rookie, a beautiful brunette girl, and toss her into the drivers seat. I jump into the passenger seat. We begin our chase; at the end of the dirt road it becomes hard top that leads into a rotary. On our right are houses lined down a highway, and people are walking both directions on the sidewalk and the grassy stretches between the back of peoples houses and the highway. Seeing my partner rushing down this direction I tell the rookie to go farther down the road and that I would get out and stalk backwards sandwiching the criminal between my partner and I. As we pass by my partner I see from the corner of my eye that he falls to the ground next to a grouping of people. I yell and the rookie stops. I dodge out of the car rolling into the grassy hillside next to the road, standing up I hold my empty gun by my side. I scan the group ahead of me for the face I saw on the dirt road only minutes before. There he is standing on the outer edge of the group near the road slowly inching his way toward me but looking backwards as if we were following him on foot as well. He holds my partners gun in his right hand, so I walk quickly up behind him and hold my gun to his back. "Drop the gun, it is over" I say, but I am enraged and upset for my partner, I am thinking to myself Kill him; take your partners gun and shoot him through the head, avenge your partner! but I just can't, it wouldn't be right. Even though he is the lowest category of life there is he still deserves his rights to a fair trial. He tosses my partners gun away, and I lead him back to the car. I tie his hands with rope because we misplaced our handcuffs. I sent the rookie back to the body to make sure everyone stays the proper distance away, before she leaves she calls in back up. A police officer from the town we are in shows up, acting cocky because he is first on the scene to help capture the infamous serial killer. The rookie returns because the local police have set up the crime tape. She asks me if I am OK but I just nod. I am still struggling with why I didn't kill the bastard when I had the chance. Finally the FBI truck pulls up to take away the killer. I load him into the back of it, which is a wide space with benches on the sides. You take the chains attached to the seat and handcuff the perpetrator's wrists and ankles. All along he is grinning as though being caught was the least of his worries. As my rookie locked his legs into place he turns and faces me and whispers to me "I'm crazy Special Agent, I'll end up in a hospital!" I know he is right, the justice system is flawed horribly. The worst end up going free while those who can be saved are thrown into jail. The rookie hugs me when no one else is looking, and looks into my eyes communicating that she is here for me. The city cops are chatting saying "Yeah, they'll prob just send him to some mental hospital and he will get out in a couple of years"
It then cuts to a couple of years later. I am sitting with the rookie, my father, and Mikey. Mikey and my dad are playing chess while the rookie is on the phone with someone from the Agency. There is a TV hanging from the corner of the ceiling, and on it is the Killer, who just completed his "treatment" at St. Elizabeth's, being set free. My dad turns to me and says "You should have killed him" and I reply "It would not have been right, plus they would have had witnesses to me using my partners gun - But now he is free game" The rookie, who is now my partner, nods her head in agreement. I wake up