Naturally I'm looking out for sources that follow my line of reasoning, so it's not outside the realm of possibility that there are publications that disagree with my view. I'm currently following the mindset that some (to which degree I don't want to speculate) instances of bullying are the results of an evolutionary adaptation.
This review raised some points I've suspected myself, while also maintaining that it's difficult to absolutely determine, which I also agree with - which some of you apparently do not.
The paper also mentions that interventions can certainly be successful, as Nova Stephania mentioned.
So, I do follow the narrative that bullying is an evolved adaptation, and that there is a plausible genetic origin to some (limited?) extent. The aforementioned review concludes as much, but also raises several interesting questions that have yet to be properly answered. That, in my opinion, would render your statements (e.g. "It absolutely is") absolutely false without proper nuance.
Bullying
can be taught, but to what extent? Bullying
can be genetic, but to what extent? There's not enough proof to answer both. Maybe me stating that it's genetic and the resounding "no" is a result of the misconception that genetic are somehow absolute and deterministic, which they are
absolutely not:
We emphasize that human evolutionary behavioral strategies are not believed to be fixed, unresponsive, genetically pre-determined programs.
For those interested, look up behavioural epigenetics. It hasn't been explicitly mentioned (as far as I noticed, skimming through it) but I suspect it's very relevant indeed.
Hope that at least it incites some of you to shift whatever paradigm you've imagined on the subject to a more grey-field area.