As a biologist, I have a guess, but take it as an informed guess : Pseudo-panspermia is a hypothesis in which life on Earth was created because organic molecules already existed in the universe, and fell on Earth, where the conditions were right for the processes that generate life, like a primordial soup. Discovering complex molecules in space supports the Pseudo-panspermia hypothesis, and if this process happened on Earth, it is possible that it happened in other planets where the conditions were also right.

The dust that pervades the cloud’s cold, dark depths is key. Dust offers surfaces for atoms and molecules to glom onto, allowing them to become larger and more complex; it also blocks ultraviolet radiation and other high-energy light that could otherwise tear apart bigger compounds as they grow. Deeper in the clouds, more dust blocks more radiation, temperatures drop, and water and carbon dioxide ices coat the dust grains, along with molecules of increasing complexity.

I can imagine a small amount being created by happenstance but not a large amount

I can imagine a small amount being created by happenstance but not a large amount