Before getting into debate let me make it clear that Dasham Granth Sahib was compiled by Bhai Mani Singh ji(Saheed, we chant in ardass 'Band Band Kataye') who was not only brahm gyani sikh but also childhood buddy of Dashm Pita and hav spend his entire life under guidence of guru sahib.And that pious soul cannot be wrong.
Now about the debate.
firstly we should clearly differenciate between gurumukh and manmukh. If true sikh like mani singh ji a close associate of guru sahib claims it to be gurujis compositions and we 300 years after are putting disclaimers. absolutely manmukhi ! as our mind does not accepts?
Secondly, we should try to understand that Guruji was a saint, a complete saint by acts and thoughts.he was complete manifest appearence of guru grainth sahib. He never did nindaya of any one even of Aungjeb (he praises his bravery in bachitar natak), harichand etc. he had only praised the deeds of krishna, rama, durga, chandi and others who ever has raised agaist the evil, whats wrong in that? And every time he says that he is das of Akal no co question of devi puja arrives. its devi mahima but not puja and who ever is entitled for that he had given it. again trait of a true saint.
Thirdly, Guruji should be seen as a greatest of all poets and as a GURU. When he is guru he writes Jaap Sahib, sudha savvaiye, tv prasad savvaiye etc and when he is a poet he composes bachitar natak, chandi ki vaar, krishna avtaar, and when he is a teacher he teaches his sikhs behaviours that they should practice and one they should avoid, hikkayaits.
Fourthly section of triya chritra which is termed as most controversial ond often disclaimer is made as dasnh granth sahib is not the bani of guruji. Yes when this section is read by we people, who are entangled in kam vaasna, yet not liberated of it, not understanding 'SANSAAR SAMUNDE' and 'IMPACT OF MAYA' or 'BHAVSAGAR', often make mistake of understanding it, Like often people do in interpritting 'Kujhraho temples'. Yes guruji has presented the kama, but remember it is presented by perfect saint (Uch da peer, peer-i-hind as guruji is represented) hence its purpose and sence changes. it is only to make his sikhs understand, the human manifestation of kama, when kama rides a man how he beheaves, how he forgets his real duties and get engaged in bodily and other pleasures and ends up as a looser. And we are kami purush, and thus our analysis will certain take it through the point of sensuality.
we should be thankful to guru sahib that a true saint had written over this issue. as practically what have made people most deviant through out of the history of world is this kama and guruji had very boldly taught his sikh how kama look when it takes human form.
So our collective mental intellenge even cannot match a single inch of that of guruji's. if reading that if any sence of valgourity or sensuality develops one should accept that still our mind is infected by kama because its only thinking and accepting in its own way, but not by Guru Sahib's
