Hydrogen fuses into helium. Helium (by the triple-alpha process) fuses into novel isotopes of lithium and beryllium, which decay in attoseconds back into helium, unless the beryllium is fused with a third helium nucleus/alpha particle to form stable carbon-12. That carbon is in the presence of hydrogen, and is then blown off of the star surface, so you get interstellar mothballs wherever you have stars.

Clearly, the someone was whoever not within but above and before our universe. They wanted to guard their physics simulation against interdimensional pests.

Of course, this is also talking about downvotes, so...