Moral injury is the damage done to one’s conscience or moral compass when that person perpetrates, witnesses, or fails to prevent acts that transgress one’s own moral beliefs, values, or ethical codes of conduct.
“Moral injury is damage done to the soul of the individual.”
The article talks about war. Cowardice is bad as well. If you shy away from the battle, you can miss it; and that can be worse than fighting, it can be worse than losing. You can end up old, with no battle left worth fighting. You can end up hating yourself.