California gang member, a convicted felon, goes on shooting rampage, killing 3, while on probation

A California man — a convicted felon out on probation — is facing multiple murder charges after he allegedly went on a shooting rampage that took the lives of his current and former girlfriends in Riverside and San Bernardino counties, according to authorities.

Officers say Louis Peter Hernandez, 41, entered a home Nov. 25 in Fontana, and allegedly shot and killed his girlfriend along with one other person inside the home. Hernandez then allegedly traveled to Riverside County and shot and killed his ex-girlfriend, according to a release from the San Bernadino County District Attorney.

Authorities added there's also an ongoing investigation into a fourth gunshot victim who was allegedly involved in an altercation with Hernandez. That victim is recovering in the hospital.

According to the release, Hernandez is a known gang member with a violent criminal history, and was on probation and post-release community supervision at the time of the shooting spree.

Must have dissed him and gotten out of line.

Trouble with lack of impulse control in some brains is that later consequences of actions are not even considered. No inhibitions at all. Then “Maybe I shouldn’t have killed them.” Two days later in jail.
I’ve written about this topic here before, largely about research that I remember was abruptly shut down cold during the Reagan Administration because of the controversial nature about urban crime and riots being linked to this brain aspect.

Nat.Lib.of Medicine has such articles as ones on The role of monoamine oxidase A in aggression-——

Proactive aggression is typically initiated by the offender in an instrumental fashion, and directed towards a rewarding and/or positive outcome, such as power or dominance status.
....
Reactive aggression consists in the uncontrollable and/or exaggerated defensive responses to perceived provocation or threat. Accordingly, individuals with reactive aggression exhibit a hostile attribution bias, i.e. higher propensity to perceive provocation or threat in response to neutral stimuli.
Animal models offer a unique experimental tool to investigate these issues; in particular, several lines of transgenic mice harboring total or partial loss-of-function Maoa mutations have been shown to recapitulate numerous psychological and neurofunctional endophenotypes observed in humans.
....
In summary, the total congenital deficiency of MAOA, termed Brunner syndrome, has been shown to result in antisocial behavior and abnormally high levels of aggression in patients; these findings have been paralleled by similar results in mouse models harboring null-allele mutations of the Maoa gene.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4865459/#:~:text=In%20summary%2C%20the%20total%20congenital,mutations%20of%20

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