I think we're talking about different things. Targeting groups because you want to 'grief' the human beings in that group, thats wrong. People shouldnt target SDC because they want the human being behind the Wizard to be unhappy. But targeting a group because of how that group acts in-game is totally valid, even according to Braben himself: if a group of people announce they are pirates, or murderers, or slavers, it is absolutely legit to have 'good' cmdrs hunt down' these 'evil cmdrs'. The Wizard for example has attempted to murder me every single time we met except one time, when I was in a corvette and he in an asp. I can totally try to target that specific individual for trying to murder me over and over again. I am sure SDC agrees with that.
As long as it remains on that side of the reasoning, then yes, that's i think that's ok.