This included some of the largest and highest-casualty battles the Greek world had yet seen. Nevertheless, it seems that “being well-adjusted” during this was in fact Epicurus' goal.
Yes - I would say that he was being well-adjusted, but by opposing every significant philosophical position that was accepted by that sick society. So even a complete revolutionary has their own form of peace of mind - which you gain by opposing sickness with all the vigor you an muster.
Joshua mentioned Giordano Bruno in our latest podcast, and I suspect Bruno would say that he too had peace of mind standing up to the church even as they were burning him at the stake.