Does the lack of "mirror life" tell us anything about abiogenesis?
As far as I know, there isn't too much we know about why life is "left-handed". So far the prevailing hypothesis is that in space there may be a tendency for amino-acids to favor one chiral-state over another, and there's some very smart people who are testing this, as opposed to the 50:50 shot here on Earth. 

To answer your question, however, the general consensus is that life came from non-living 
material. Pan-spermia, intelligent design, and the rest are more fringe ideas, so the question is how life formed from non-life. One of the ideas is that the basic building blocks came from space (likely a comet or meteor), and if the idea that amino acids favor one chiral direction over another in space can help support that hypothesis.