My new working perp theory: 1) Isolated loner white guy deviant sex pervert killer with a rural farm or homestead in region, possibly with military background.
I think that this is a possibility and over the years, there have been a small number (thankfully) of horrific crimes with that involved an attacker(s) murdering a family to kidnap an individual that they were interested in.
This possibility maybe heightened by the small town ordinary lives of the victims: They had very stable lives and worked together at the same plant for twenty plus years. The mother taught religion classes at a church. The father’s favorite topic of conversation was Wisconsin football. Heck, they did not even have political signs out, let alone present themselves as being extremely partisan politically.
Their stable, unassuming lives seemed to extend outside of work and home: No apparent debtor lifestyles or gambling hobbies. No property disputes. No reputation for having confrontational personalities or for aggressive business practices. No apparent troubled boyfriends with Jayme and no apparent involvement in affairs or “swinging” lifestyles regarding the parents. Moving on to criminal motives, no apparent involvement in even recreational drug usage, let alone sales. Likewise, no apparent arrest histories and no friendship with say, outlaw bikers or small town crime clans.
Rather, everything points to the victims as being quiet, unassuming, and “
salt of the earth” type people. The only thing that might support another motive besides the one you mention is the apparent contradiction between their daughter’s multiple healthy sports / dance activities, the mother’s teaching position (teachers are usually out going) with a neighbor’s observation that the family was very private and
“almost reclusive”.
This could point to a desire- but not paranoia, to keep their place of residence from becoming well known. This possible desire may have stemmed from an encounter with someone. As recent contacts have probably been examined, perhaps the possible encounter occurred in the more distant past?