Children who failed to grasp the kidnapper's motive and the reason for the arrest judged him to be  good,  not  bad. 
( ( Children ( who ( failed ( to ( grasp ( ( ( ( the ( kidnapper 's ) ) motive ) and ) ( ( the reason ) ( for ( the arrest ) ) ) ) ) ) ) ) ) ( ( judged ( him ( to ( be ( good ( , ( not bad ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Children)) (SBAR (WHNP (WP who)) (S (VP (VBD failed) (S (VP (TO to) (VP (VB grasp) (NP (NP (NP (DT the) (NN kidnapper) (POS 's)) (NN motive)) (CC and) (NP (NP (DT the) (NN reason)) (PP (IN for) (NP (DT the) (NN arrest)))))))))))) (VP (VBN judged) (S (NP (PRP him)) (VP (TO to) (VP (VB be) (ADJP (JJ good) (, ,) (RB not) (JJ bad)))))) (. .)))
Kids who don't understand why kidnappers are doing what they are doing thought they were bad.
( ( Kids ( who ( ( do n't ) ( understand ( why ( kidnappers ( are ( doing ( what ( they ( are doing ) ) ) ) ) ) ) ) ) ) ) ( ( thought ( they ( were bad ) ) ) . ) )
(ROOT (S (NP (NP (NNS Kids)) (SBAR (WHNP (WP who)) (S (VP (VBP do) (RB n't) (VP (VB understand) (SBAR (WHADVP (WRB why)) (S (NP (NNS kidnappers)) (VP (VBP are) (VP (VBG doing) (SBAR (WHNP (WP what)) (S (NP (PRP they)) (VP (VBP are) (VP (VBG doing)))))))))))))) (VP (VBD thought) (SBAR (S (NP (PRP they)) (VP (VBD were) (ADJP (JJ bad)))))) (. .)))