On a societal level murdering people can't really be considered acceptable, sure.
That said if you're especially angry and going to murder someone, a health insurance CEO is definitely an very solid choice. Unlike all the retards and mongs who go "Grr I'm a retard and I'm mad and also a loser so I'm going to go shoot people at my local school/grocery store."
Of course now that a guy has done a violence against someone who many people believe warranted it, now you've got idiots all over the internet salivating constantly at the idea that maybe another guy might throw his life away to murder someone they don't like. I hope Elon Musk gets Luigi'd. I hope [other guy] gets luigi'd.
Also there are a ton of absolutely mentally retarded women online who are free to develop weird sexual fantasies about the guy and make saucy posts about how hot he supposedly is, because he possesses the most desirable trait of all: he isn't actually available, so none of them will ever be expected to follow through on any of it.
The internet's response to the whole situation has been mostly stupid and irritating.