Use python to make sure that iTunes is never, ever allowed to run.

gistfile1.txt

#!/usr/bin/python
import psutil
import time

times = 0
while True:
  time.sleep(1)
  lst = psutil.get_process_list()
  for p in lst:
    if p.name == "iTunes":
      p.terminate()
      times = times + 1
      print "DIE iTUNES!!! (killed for the " + str(times) + "th time)"