Good job on the mockery with sci-fi versus scientific reasoning.
Honestly, a few of the triggers are already there and have been documented.
1) On-again-off-again relationship, already strained relationship shows increase in stress from prior happenings in life.
2) 3-month old baby would be indicative of increased stress levels from lack of sleep, trouble with coping with a new role. etc.
3) Having trouble with work situation (see terrible season by the team), increased stress levels r/t possibility of losing job, and generalized feeling of inadequacy.
I think we can all agree that we as people in general do not perform at peak mental level when stress is high. Some people claim shooting a gun in an area of high stress our accuracy can be reduced as much as 50%. Others acquire insomnia and eating disorders.
Just like in medicine, many things will have additive effect on a persons body to increase risk of hypertension etc. If these are stress related, they can increase the probability of us doing things that we typically would not do under duress after a breaking point is reached. The is part of the reason why any signed contract when under acute pressure is easily thrown out in court. No single person knows where there breaking point is until they have been pushed well past it.
Sociology shows us that there are patterns r/t demographics, religion, and many other factors that increase our predisposition towards doing certain acts, both criminal and non-criminal. Simple examples, those people that are of parents that have been divorced are at an increase risk of divorce themselves. People that have parents with addictive personalities are at an increased risk for addiction themselves. People that have friends that have committed suicide are more likely to commit suicide themselves.
My point is that if we (everyone, not just the forum) as a population, would look at situations such as these, specific markers that place a person at higher levels of instance (genetic, ideological, etc.) would allow us a better understanding of what is going on with people and *MIGHT* help prevent things like this from happening in the future.
Hate and malice breeds hate and malice.