Having read the book "God's Undertaker", and the book "Amino Acids and the assymetry of life", I have come to the conclusion that a huge chunk of science is "eating fruit from the poisonous tree" in the sense that working assumptions are being used routinely that have a heap of experimental evidence going against them (as opposed to the legal metaphor where evidence is gathered illegaly). Alternatively, they place false doubts on experimental evidence because the simple mathematical models they put on them don't match with those experimental results.
For instance, one would be confused for thinking that the thousands of experiments done on the origin of life on Earth have demonstrated the plausibility of life originating on Earth. Nothing of the sort has happened. ALL the experiments start with the assumption that life started here, and they concentrate on one particular tiny aspect that has to happen a particular way for life to have started here, and the proof that it happened comes DIRECTLY from the assumption - ie. we are here so it must have happened.
With chirality, almost all carbonaceous meteorites have demonstrated chirality with their organic molecules. This has been used to prove that similar Earthly chiral molecules have non-life origin, rather than the quite different *Similar Earthly chiral molecules are as much linked to life as those from Carbonaceous Chondrite Asteroids*. There is no evidence for or against living matter having been in asteroids other than this chirality evidence, which wouldn't rule it out, but retain the possibility. Racemic organics would have ruled it out.
The explanation of how the meteoric (and Earthly petroleum) organics had become chiral is based on mathematical models of carbon molecules under high pressure. It is not based on experimental evidence. It is a classic case of believing the simplified model over testing out a typical experimental observation to back up a possible working model.
A similar thing with the model of how Comet organics became chiral.