To be absolutely clear PvP in no way is causing any real suffering to anyone. If anybody says differently they are way over exaggerating the effects video games can have on a person's real life.
It is a game. Plain and simple just a game. And if anyone takes getting killed in a game as upsetting their mental and emotional stability then they should really go get their head checked out professionally.
If you were to repeatedly interdict/splat the same person it could tip the balance into being a bit naughty depends how you go about it.
However the dev's advise blocking for things like that, so no player interaction should ever really get to the properly negative stage.