the screenplay never lets us forget that bourne was once an amoral assassin just like the ones who are pursuing him 
(ROOT (S (NP (DT the) (NN screenplay)) (ADVP (RB never)) (VP (VBZ lets) (S (NP (PRP us)) (VP (VB forget) (SBAR (IN that) (S (NP (NN bourne)) (VP (VBD was) (ADVP (RB once)) (NP (DT an) (JJ amoral) (NN assassin)) (PP (ADVP (RB just)) (IN like) (NP (NP (DT the) (NNS ones)) (SBAR (WHNP (WP who)) (S (VP (VBP are) (VP (VBG pursuing) (NP (PRP him))))))))))))))))
(ROOT (S (NP (DT ) (NN )) (ADVP (RB )) (VP (VBZ ) (S (NP (PRP )) (VP (VB ) (SBAR (IN ) (S (NP (NN )) (VP (VBD ) (ADVP (RB )) (NP (DT ) (JJ ) (NN )) (PP (ADVP (RB )) (IN ) (NP (NP (DT ) (NNS )) (SBAR (WHNP (WP )) (S (VP (VBP ) (VP (VBG ) (NP (PRP ))))))))))))))))