They’d also have to contend with re-entry.
The icy bodies from the outer Solar System that contain such organic substances are very easily vaporized during entry in the atmosphere of the Earth, so only a negligible fraction, if any, of the organic substances originally present in such a body would reach the surface of the Earth.
Then Earth collided with a great number of small bodies formed in the outer Solar System, which were rich in water and organic substances. This has modified the composition of the Earth towards the current composition. (Later Earth has lost a part of its hydrogen; because hydrogen is very light, it is lost continuously from the upper atmosphere, after water is dissociated by ultraviolet light; thus now the Earth has less water than around the appearance of life.)
This theory is likely to be true, so meteorites probably have brought a good part of the chemical elements most needed by living beings.
However, most of the pre-existing organic substances from meteorites must have decomposed and whatever has been preserved of them could not have had any significant role in the appearance of life here, because any living being would have needed a continuous supply with any molecules that it needed, otherwise it would have died immediately. Such a continuous supply could have been ensured only for molecules that were synthesized continuously in the local environment here, not for molecules arriving sporadically in meteorites and which would have been diluted afterwards over enormous areas, down to negligible concentrations.
You might consider that scientists advanced enough in their field to be launching missions to retrieve dust from asteroids are actually aware of basic facts relevant to their field of study.
I’m not saying the person you are responding too is right - but appealing to authority on something like this has a pretty bad track record.
I think the OP meant that Earths magnetic field and atmosphere shields any terrestrial matter far more than than a bare asteroid that has no such protections, so it seems implausible at first glance that these things would develop or survive in open space rather than here.
I don't think "organics developed in the vacuum of space" is implied. Survived? Well we have samples now confirming, if I'm understanding the basis for the discussion (the article).
But what we don’t have is any examples of them surviving re-entry.
We also have a massive amount of those same compounds already here on the planet.
Causality is… tenuous. But not impossible.
Experiments do not tell us that something IS a certain way; only the ways it is not.
It’s nearly impossible, but it is the holy grail!
This experiment was to try to falsify one theory, yes, but as you note that is a very long way from the actual goal - or the level of certainty that the article is trying to imply.
These articles are written due to funding needs, which is why the articles are the way they are - and why the scientists themselves are likely cringing too when they read these articles. At least until the checks (hopefully) arrive.
Praying[0] is a good start! That, coupled with large amounts of suspension of disbelief[1] helps too.
I suggest drinking (or whatever your preferred brain-fogger might be) heavily. That helps you ignore the details -- because the "devil is in the details" and we mustn't have that, right?
[0] Also known as "begging an imaginary sky daddy for help"
There is, after all, a war on Christmas, Christians and Christianity.
Christian enclaves are being attacked and Christians are being murdered in the thousands every week, just for being Christian.
Hundreds of decent, god-fearing Christian women are being raped daily by strong, manly Muslim men. Their strong muscles rippling under their tight clothes, stirring up strong, lustful feelings among the faithful Christian men.
It's no wonder that folks are kind of touchy. If you risked being shot, blown up, cuckolded or otherwise made dead or humiliated every time you went to a church, made the sign of the cross or put a "Jesus is my Co-pilot" bumper sticker on your vehicle, you'd be concerned wouldn't you?
And that happens every day because people hate them for their knowledge of the truth. It's all there in the literal word of god that's in the Holy Bible. Anything else is heresy. And we know what to do with heretics, don't we?
Icy meteorites never survive re-entry that I’m aware of; and most carbon/chondrite ones don’t either, but they are the most common type that do. They tend to be ‘dry’, however.
Re-entry is a very ‘angry’ process.
The fragility of life-as-we-know-it that has undergone serial passage in an environment largely shielded from radiation, is not necessarily representative of putative life-forms carried by little rocks in space.
I am neither convinced for nor against the idea that life may have been carried over by interstellar rocks: on the one hand, its a major promiscuity between celestial bodies within star systems, galaxies, etc. on the other hand since we haven't discovered other life forms yet we have no idea on the missing probability densities of life in the bulk of the universe, so the Bayesian catapult can swing either way, we just lack the data for now.