More interesting than conspiracy-seeking are a couple of similarities that are actually a lot more recent ones, which are also more likely to have been the triggers for suicidal actions:
Shamsud-din Jabbar was divorced 3 times, the most recent one (2022) turning nasty, with his wife getting a restraining order and eventual child custody, and his latest real-estate management business (he previously started several unsuccessful companies) was bleeding money - he was seriously in debt, with child-support payments and going broke. Whether or not he had PTSD before, that's extremely stressful and creates fertile mental ground for isolation, radicalization and/or violence. He initially wanted to "only" kill his family, but that wouldn't get that much media attention.
Matthew Livelsberger (Cybertruck in LV) had clear signs of PTSD (and probable TBI) and just days before he staged the "spectacular, attention-grabbing" suicide he was apparently dumped by his second wife (they have an 8-month old child).
Investigators in Livelsberger case should also look into possibility of him being treated, or self-treating, with psychedelics - there has been a lot of hype recently about using a range of psychedelics (ibogaine, ayahuasca, ketamine, psilocybin/shrooms, mescaline/"San Pedro", LSD+MDMA/"Candy Flipping", etc.) to treat PTSD and TBI, but little, if anything has been published about side-effects, such as HPPD and so on...
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