A lot of evil things were done in history with the thought of the “greater good.”
That kind of makes a little sense. When Rumple is imprisoned, don’t they put him in the abandoned mines? The dwarfs, at least Snow’s dwarfs, aren’t mining anymore, and we’re told that’s their sole purpose in life and they love it. So it seems that the fairies source of magic is of the non-renewable resources variety; the beans are lost, the mine (at least that one) is closed, and the there is only one enchanted tree remaining. And what’s even more interesting is that the most powerful source of magic of all, true love, is elusive to them.
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Keeper of Rumplestiltskin's and Neal's spears and war paint and crystal ball.