9mm and a Three Piece Suit Lyrics

Lyric discussion by holmeise 

Cover art for 9mm and a Three Piece Suit lyrics by Streetlight Manifesto

kalnoky uses a lot of heist and gangster themes in his songs (everything went numb, keasbey nights, point/counterpoint etc), does anyone know if there is any particular significance in it? or does he just like that kind of scene?