i'm pretty sure it has something to do with the innate american desire to be important or famous. along with the acquired ability to become a serial killer or an assassin. the only difference being that the latter gets the entire middle name, instead of just the initial.
speaking of which, i don't see why a serial killer gets such a title. a mass murderer or massacrer [i had to look it up, it looks fake to me.] is someone who kills indiscriminately or wantonly. and though it is a bit different from what a serial killer does, is there anything so different about being nutso to the point that you plan killings and do the same neurotic thing every time, than just whacking people spur of the moment?
"i'm bugger off, that's who.." -w.