Its a fool that regrets being nice because of the unkindness of others, its simply the way of this world. Leave sugar out and both flies and bees will be attracted to its sweetness in equal measure, then leave out rotten filth and watch, only flies will go near it. There is no escaping the flies they will always be there, its just a matter if one wants to continue being sweet for the bees or to abandon all that to be left only for the flies.