Factors unrelated to the conduct of the bank may explain the arson attack on Friday that injured as many as 26 people at the Springvale, Melbourne branch of Commonwealth Bank. The bank said 15 customers and staff were inside at the time of the fire.Among those most severely burned is the alleged offender, 21 year old Nur Islam. Media reports suggest Islam set himself alight, having spread accelerate within the branch.Melbourne's Sunday newspapers linked Islam's alleged motive to his loss of income support from Centrelink and anxiety over residency (being a refugee). Each also reported remarks of housemates and other associates speculating on the mental health of Islam.No court hearing (even by a hospital bedside) had been held as of last night to consider any charges against Islam.This arson episode is unusual, maybe exceptional. Violence directed toward banks and staff at bank branches, in the form of armed robbery, is nothing new.Current data on stereotypical "stick ups" at bank premises is not readily available, though police statistics suggests armed robbery activity in the community in general is no more common now than five years ago.Stephanie Arena, from the Australian Bankers Association said that "the number of incidents at bank branches has fallen significantly for some years and is now at a record low."