apportion

/ə-ˈpȯr-shən/

borrowed from Anglo-French aporcioner, apporcioner "to divide up, assess (a tax)," (also continental Middle French apporcionner), borrowed from Medieval Latin apportiōnāre, from Latin ap- {et_link|ap-:1|ad-} + Medieval Latin portiōnāre "to divide into portions"

verb

  1. to divide and share out according to a plan; especially : to make a proportionate division or distribution of

idiom

  1. to say who should be blamed

Any attempt to apportion blame so many years after the incident is pointless.