Earlier quoted context omitted.
I think Linus (and others) choose to stay verbally abusive because there they exist in a community that both facilitates and defends that poor behaviour. There is a choice to be made. The choice stems from the basic mindset: am I fundamentally ok with verbally abusing people around me, or should I try to stop doing that? I don't know what's in Linus' mind. Perhaps he is utterly incapable of never resorting to verbal…
It is in part a cultural issue. Realise that this form of "abuse" does not carry much weight in a lot of cultures. A lot of the strongest criticism of Linus comes from a cultural background where people are hyper-sensitive to direct language.
Direct language, without verbal abuse:
"I am upset and angry that you keep making the same mistakes."
That's clearly communicating how he feels, without verbally abusing his audience.