Sutra:
202. ivaRRai dharmamengiRadhu pramiththa arjunan karuththAlE.

Sri PBA Swami's Sarartha Deepikai:
Since these means are against the true nature of the soul, should they not be called adharmas; instead, why are they being called dharmas?

This was said taking into account the fact that Arjuna was confused and thought that these are dharmas, while forgetting his true dharma which was to do battle.