no. it was his illness that rendered him like this. Remember what the psychologist said? She doesnt know anything about all this tapu business she generally said diddnt she that addicts who are not fully treated are prone to self harm...harming others and so on. Vansh could not understand the basic principle of trust in a marriage because of his illness. Tapu is certainly responsible to a certain extent but is not the full cause and the psychologist had predicted this.
madam sometime try to think unbiased way, whn Nani poisoned ur Tapu, she is guilty for all crime done by Tapu, even u r saying Tapu is normal. whn Tapu poisoned a addict, which is not fully fit, thn he is guilty for himself. dont u understand its easy to poisoned a addict thn a normal person and it will more dangerously affect on a addict mind? u r throwing all ur energy to justify Tapu crime only on the basis of tht she is poisoned by Nany and at the sametime u r ignoring the fact tht its Tapu took him to tht situation. she loved Ichha, and was on the rit way of being normal. but how can ur Tapu see tht Ichha was getting love. if u remember she was not only jealous whn Veer show concern, but also whn Vansh show his love. so dont again defend her with the mask of Psycologist. u r forgetting Tapu was not one of the reason but ONLY reason who instigated Vansh, and took to tht situation. atleast stand firm to ur principles. if poisoning Tapu mind is crime for Nani, thn poisoning Vansh mind by Tapu is also a crime. there is no second thought.