No, it's not a stoopid question. Heck, when I was running stock SH3 I was accidentally firing torpedoes all the time by hitting "enter" (I played Civ4 a lot and that is the key for "next turn").
Try installing GWX 2.1. It changes the "fire selected torpedo" to "Control+Enter", making misfires much less likely.
All the best. KH.