I am dealing with a new player who occasionally refuses to fight. He is playing a hermetic druid who is only concerned about threats to the forest. If an enemy is not harming the forest, he may refuse to fight. When his turn rolled around in said fights he said "I do nothing, this isn't my fight."
I don't want to force him to fight by making every enemy into a bio terrorist or by having every enemy target him specifically, but I also don't want the party to turn on him for not engaging in fights. They have been polite about such things so far, but I doubt it will last when a character dies due to his refusal to fight.
What do you think I should do about this player?