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)))))))))))))) (. .)))
They may be defending other cultures despite not wanting to.
( They ( ( may ( be ( ( defending ( other cultures ) ) ( despite ( not ( wanting to ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP They)) (VP (MD may) (VP (VB be) (VP (VBG defending) (NP (JJ other) (NNS cultures)) (PP (IN despite) (S (RB not) (VP (VBG wanting) (PP (TO to)))))))) (. .)))