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Honestly, if Toby hadn't, Sweeney would have, or the police would've gotten him and either beaten him to death or have him hanged for murder.
First time I saw it, though, I was just so stunned. I was sitting there in the middle of the theatre with my mouth open like an idiot. xD;

well, it was still sad. plus, toby prolly killed sweeney caused he killed mrs. lovett.

Well, Sweeney deserved it. He DID kill Mrs. Lovett, who was like a mom to Toby. I mean, wouldn't you be extremely pissed if your parents were unnecessarily killed? ;(

Allow us all to put ourselves in Toby's position.

You're a little boy, prehaps 12-14ish. depending on who cast you, though I like him younger cause the idea of like a 17 year old singing, "Nothing's gonna harm you" makes it seem romantic in my eyes.
You don't have parents cause you're momma left you at a work house.
You're abused by this werid Italian guy that looks an awful lot like Borat ( rofl ) and the only woman who shows you kindness in the world is Mrs. Lovett.
But is she the sweet woman Toby made her out to be? I think not. He discovers his favorite pies are made from Human flesh!
Then he watches his favorite person in the world get killed.
I think he just had enough. He went off his rocker. And that why he killed Sweeney.

One of my friends said the exact same thing when she saw Sweeney Todd the first time

Whether or not Sweeney knew Toby was there, his death was inevitable and had to happen. Sweeney Todd was not a person in his own right, in my opinion- he was just the psychotic, soulless shell of Benjamin Barker. He had been totally destroyed by everything that had happened to him, and had nothing left to live for.

I think Toby's act of revenge is very sad, but not because of the loss of Sweeney Todd.

By killing Sweeney, Toby could be trapping himself in the cycle of hatred and violence, dooming himself to become very like Sweeney.
Toby is already scarred by the experiences he's had in his childhood (the workhouse and abuse at the hands of "Pirelli", not to mention finding human fingers in pies and seeing his mother figure burned to death in an oven), experiences which would be seriously psychologically damaging to an adult.
Actually murdering someone at such a young age cements his fate.

As far as I can see, he has nowhere to go but back to the workhouse or onto the streets to become a pickpocket, and after that he is likely to grow up psychopathic, sociopathic, nihilistic and in other ways mentally unstable. I know very little about psychology, but he will basically be messed up for reasons which are mostly not his fault. I find that sad.

HAHAHHAHAHAHAHAHAHAHAHAHA.

'Twas Pirelli's Miracle Elix--BOOM!

OH LORDY.

xd