I agree it's one piece of a much larger puzzle towards global sustainability. But for me, that's still a very abstract concept and my actions are a less than a drop in the bucket in that regard.
However, being my own power plant, owning my own power... "Seizing the means of production", if you will, is incredibly concrete. And selfish.
If I were selling PV to rednecks, I don't even think I'd mention climate change.