Pacifists have usually regarded the use of violence....

“ Pacifists have usually regarded the use of violence as absolutely wrong, irrespective of its consequences. This, like other ‘no matter what’ prohibitions, assumes the validity of the distinction between acts and omissions. Without this distinction, pacifists who refuse to use violence when it is the only means of preventing greater violence would be responsible for the greater violence they fail to prevent. ”

Peter Singer

From : Practical Ethics