Fortunately, his intended victim survived the shooting. I would also suspect that if the shooter had legitimate issues, instead of having provoked the earlier difficulties he experienced, he would not have been the sort of person to come down their with a gun.
In addition, if indeed he had a legitimate problem with the phone company, it is unlikely that front-line employees, as opposed to high-level corporate policy, was responsible.
So it seems to me there is enough information to reach the conclusion that he was a violent individual, who posed a danger to peaceful ordinary people going about their jobs - and not, say, a heroic revolutionary figure, as some posters seem to prefer.