But the question must be posed: Who bears ultimate responsibility for their deaths? Blame for these tragedies must be assigned where it belongs: In the first instance to the criminal Israeli apartheid regime and its US backers, together with the whole reactionary Zionist project of establishing an exclusivist Jewish state by expelling Palestinians and confining them to a constantly shrinking set of open-air prisons and ghettos.

This is incorrect. As the individual bares responsibility for their actions above "the criminal Israeli apartheid regime and its US backers". Because this how personal responsibility works.

It is not 'based' to blame others for your crimes or immoral actions, no matter how 'oppressed' you are.

That's not what that means at all!