Sweeney Todd wanted revenge because, Benjamin Barker (Johnny Depp), a skilled barber, is falsely charged and sentenced to a life of hard labour in Australia by the corrupt Judge Turpin (Alan Rickman), who lusts after Barker's wife Lucy (Laura Michelle Kelly). Fifteen years later, under the assumed name "Sweeney Todd", Barker escapes the penal colony by sea, but is shipwrecked. He is saved by sailor Anthony Hope (Jamie Campbell Bower), who takes him aboard the ship Bountiful, headed for England. Upon arrival, Todd returns to his old flat above Nellie Lovett's (Helena Bonham Carter) pie shop on Fleet Street. There Lovett tells him that his wife took poison after being raped by Turpin, who then adopted Todd's daughter Johanna (Jayne Wisener) as his ward. Todd vows revenge and reopens his barber shop in his upstairs flat.
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Because, his wife got stolen, he got unlawfully charged, and he'll never get to see his daughter.
The first reason he slit the Beadle's throat was for revenge. Then he starts killing people to make them into pies.
He killed her because she knew his wife was still alive and didn't tell him. She didn't tell him because she was in love with him and was hoping one day he would fall in love with her too.
He thought she was beautiful and decided to send Sweeney/Benjamin away so he could get to her. When this didn't work, he tricked her into coming to a ball, where she got just a little bit drunk and a whole lot confused and he raped her. This caused her to take poisen, which caused her to go crazy.
the words are in french and translated they mean "i want your love i want your revenge i want your love"
I don't think so. He said he didn't want to know the name of his brothers killer so he wouldn't go out to kill him, so that hints that he doesn't actually want revenge.
To take revenge on him for making Itachi kill his own clan.
Well what she says in French is: "J'veux ton amour Et je veux ta revanche J'veux ton amour" Which translates to: "I want your love, and I want your revenge. I want your love" In English.