Huntington--like Buchanan--claims not to be a cultural  He is defending the integrity of all cultures, theirs and ours.
( Huntington ( ( -- ( ( like Buchanan ) -- ) ) ( ( claims ( not ( to ( be ( ( a cultural ) ( He ( is ( defending ( ( the integrity ) ( of ( ( ( ( ( all cultures ) , ) theirs ) and ) ours ) ) ) ) ) ) ) ) ) ) ) . ) ) )
(ROOT (S (NP (NNP Huntington)) (PRN (: --) (PP (IN like) (NP (NNP Buchanan))) (: --)) (VP (VBZ claims) (S (RB not) (VP (TO to) (VP (VB be) (NP (NP (DT a) (JJ cultural)) (SBAR (S (NP (PRP He)) (VP (VBZ is) (VP (VBG defending) (NP (NP (DT the) (NN integrity)) (PP (IN of) (NP (NP (DT all) (NNS cultures)) (, ,) (NP (PRP theirs)) (CC and) (NP (PRP ours)))))))))))))) (. .)))
Both men do not care what happens to other cultures, only their own.
( ( Both men ) ( ( ( do not ) ( care ( what ( happens ( to ( ( ( ( other cultures ) , ) only ) ( their own ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT Both) (NNS men)) (VP (VBP do) (RB not) (VP (VB care) (SBAR (WHNP (WP what)) (S (VP (VBZ happens) (PP (TO to) (NP (NP (JJ other) (NNS cultures)) (, ,) (RB only) (NP (PRP$ their) (JJ own))))))))) (. .)))