Muggles deserve nothing.
They certainly don't deserve magic. They deserve to be slaughtered like the stock they are – especially my father, a coward who deserted my mother. My mother, despite being of the purest wizarding line, was absolutely pathetic in any case. If she had been a true witch, she would have been able to avoid dying.
I see many people like this around the school. Not Muggles, but they may as well be – Mudbloods, born of two Muggle parents, running around as they wave their wands to play at being magical. It does not matter, for I am not fooled, and I take matters into my own hands.
Through painstaking research, including many night trips about the castle thanks to my recently acquired Prefect badge, I find the Chamber of Secrets, a creation of Salazar Slytherin that has not been opened since he himself was here. Of course only I was intelligent and talented enough to locate it. Using the Chamber for its true purpose, I unleash the monster within – a Basilisk that obeys me.
I know now that I am the true Heir, and this is the first step to accomplishing a many great things in my life. I know it.
Unfortunately, the gargantuan snake is not as inconspicuous as I am. I only manage the murder of one Mudblood before it is no longer safe for me to continue, so I send the Basilisk back to where it came from and frame it on a half-giant named Hagrid. He is expelled and I am awarded Special Services to the School for stopping him, but Dumbledore's watchful eye on me is even closer than before, and I set my eyes on another plan.
Whatever my next plan is, I must come up with yet another to eliminate those in this school who should not be studying magic. To kill these false wizards and witches, these Mudbloods, so that only those who deserve it shall learn magic.
Muggles don't deserve magic.
Muggles deserve nothing.