The anomalous fuel was kind of difficult to get into the hands of a normal scientist.
There are 3 things, known to me, he could use for this (only counting the sandbox), "Tumor of evolution"(a lot of that stuff exists, but it would try to eat him), "Sugar Cube"(Easy to find and replicate, but would most likely screw with the machine if exposed to extradimentional energy) and finally "Peanut-Butter-Swamp".
He would have never found that out if the plot had not called for it, but it is the only commercial grade anomalous substance the Insurgency ships out in large quantities (and once you find out what it is made from you would not want to eat it anymore).
With ghosts you have the problem of individuality. Pinning your hatred for a gigantic group of people/things on one bad example is just not (rationally) justifiable.
An LED lamp exploded in my house so LEDs are bad. If we are going the "completely irrational hate" route this concern vanish of course.
Pinning it on a shadow demon, dose not fix the problem of wanting to kill everything paranormal. In this story the machines only intended purpose was to kill one demon (to hopefully get everything back to normal).
Also, as you may or may not have noticed, i tried to write it so that the existence of the shadow demon itself is in question. This might have gotten unnoticed in the way it is written, but i tried to spin this in a way that he never went to get butter. He killed his wife in an alcohol fueled outburst of insanity, before eating her and than fully spiraling out of control in the hunt for something other than himself to blame.
My little story should have given you everything you need to write your version.
Once that one reaches a v0.5 i will read it and try to integrate your idea into a version 0.8 of my story. In the best case scenario you complete a v1 before me, but should that never come to pass, my story may one day reach the main site.
Just keep in mind that these stories are just to understand the character and improve an interview transcript.
I think i will leave it as is, until creativity strikes again or i just really want to go hunt grammar errors.