Remember This?

Remains of 63 Fetuses & infants found at Detroit Funeral Home

Or this?
Bodies of 11 Infants found in ceiling of closed funeral home

Rather than speculate over what the purposes were behind preserving 1,000's of unborn fetuses for yourself, I'd just call it something with a satanic or occult compulsion behind it.

From the first discovery of the Detriot corpse hoarding discovery:

Violations included dirty floors, peeling paint, mold, improper storage of embalmed bodies, with one in "advanced stage of decomposition," and fraud, deceit, or dishonesty, incompetence, and gross negligence in the practice of mortuary science." LARA called the violations "deplorable" at the time.

The lack of information to me about current intent belies a more sordid purpose than just have a collection of fetus in jars.