I'm in and +1 for you!
What does one life matter? Hmm, interesting question. What defines what matters, and matters not? To one a life may mean little to nothing, and to another all and everything in this world. To paraphrase a quote, "The whole world grows dimmer when even one candle of life is snuffed out." To me all life matters, all life has a purpose, be it good or bad. One life? What does IT matter? If it is important to even one person, then it matters all the importance in the world. Life is the one true unique thing in this universe, there are near infinite number of planets, near infinite number of possibilities, but in all that for each living thing, each life is unique, and different. Like a drop into a lake, creating ripples that extend far past it's initial corona.
What does one life matter? It is a Schrodinger's cat...a paradox, it means both nothing...and everything. :)