[Jan-Poo]

Fine I'll take your challenge!

First:

Willard Wright: Don't forget the heart! George isn't the kind of person to lose control like that. He might get angry, but in all the tales it's a calm, clinical and focussed anger.

Dlanor: Knox's 8th! It is forbidden for the case to be resolved with clues that are not presented! Are there any clues that suggest George would become a berserker if he became enraged?

The very fact that George has been shown being overly controlling over his emotion proves that he might explode in an uncontrolled anger!

First off, let's clarify one thing: George is a human, and as every human he can get angered. In fact we've seen that he's far from a robot.

Now you can compare keeping your emotion under control the same as preventing steam from gushing out from a kettle.
A normal pot with boiling water cannot explode no matter what, but a pressure cooker? Sure it can if something goes wrong!
And that's why the very fact of holding down primordial forces is the very thing that can make thing explode!

George has in himself the conditions for that to happen. The fact that it never happened before proves nothing, induction logic doesn't work, just because a pressure cooker never exploded it doesn't mean it will never explode.

Figuring out how to kill everyone would take a lot of work for a long time. Long enough for George to calm down and come to his senses.

There is a history of "go postals" that protracted themselves for hours. Once something breaks in a person's mind it can't be easily recovered. Besides, even if George came to his senses after he killed five or six persons, what exactly he had to lose or recover by then? Nothing would save him from the death penalty anyway.

Explaining the deaths of Gohda, Nanjo, and old lady Kumasawa with George culprit theory is just getting greedy! Those three don't interact with Eva or Battler much at all. Berserk George doesn't have any motive to want to kill them!

It is possible that Shannon told George all of her sad history before her tragic death.
- Nanjo and Kumasawa are guilty. They knew who Yasu was and yet they made her live that horrible life without ever saying a word, Yasu had to live in that orphanage and then as a lowly servant for years. There is a scene in EP7 where we see Yasu being extremely enraged against Nanjo and Genji.
- Gohda is guilty. It is known fact that Gohda acted like a stuck up smug towards Shannon and Kanon. That may not be a grave crime, but that's still someone who doesn't deserve much regards. He's in the wrong place at the wrong moment, and there's no real reason to show him mercy.

Beelzebub: Beelzebub of gluttony, right here! It's too much! Killing harmless little Maria in a fit of rage is just too much! There's no way an adult like George would see helpless little Maria and still be angry enough at them to kill!

It is possible that Maria was killed out of a misguided mercy.
Usually her deaths are painless. Maybe the killer thought it was a lot better for her to die rather than live after the tragedy. Considering what Ange had to go through, you must recognize there is some truth in this logic.

Asmodeus: Asmodeus of Lust, right here! George is mature enough to know that killing Shannon's friends is no way to win her love!

The theory assumes that George already lost any hope to be with Shannon (because she's dead!) Why would he bother about that at this point?