Why do I bother?

As you know, I am a Girl Scout leader. I have been one for more than 4 years. I love volunteering, but lately I've been asking myself why I bother. Between constantly changing policies, gossiping adults, and impossible parents, I have just about had enough. I try to teach my girls to have the benefit of the doubt and to treat all people with dignity, but these lessons fall sorely short on some of their parents. Don't get me wrong, the majority of the parents in my troop treat me really well and, in fact, some of them downright spoil me. I try to remember that, but more and more lately the negativity of one parent has worn at me, no matter how hard I try to be with the situation. It has finally come to a head and the parent has informed me that she's tired of MY immaturity and is going to place her daughter in a different troop. I say good riddance, but at the same time I feel like a failure. I failed because of an email I accidentally sent to the wrong person. I did what I don't ever like to do, harm another person. I know I'll pay for it in Karma. Perhaps my lesson in all this is to take a lot more slow breaths before I do anything, and to especially check WHO I'm sending email to.