That is is good, I agree. I would also go a step further and say that predators should also fight each other, just as many do in the wild. Moreover, that is largely what we already have now. It needs only a couple of minor tweaks, as opposed to reversion.
@CodeMage and @bbtech. Gentlemen I am going to debunk this right now, and also provide you directions on how you can replicate this experiment yourselves. I will repeat what I said earlier. The Voltaries will currently aggro at the Pilgrims regardless of the players presence; not due to aggro transferance. Here is how you can test it:
Start a Singleplayer game and allow Admin rights. Go into the Admin Panel and activate ‘cloak’. Start about here on G,13 on the map, just east of the Terrace of Tenders facing back towards it to the west. Now go in that direction until you encounter this (I call it the roundabout):
Go around the roundabout on the right and straight into the garden directly in front of the lava stream (marked above). There will be 1 voltarie, a cook and at times a second craftsman, usually an alchemist, both ‘pilgrims’. Watch as the voltarie attempts to kill the pilgrims, while cloak is active (ie-it is not aggro direct towards us carrying over to them).
His aggro cannot be attributed to the player character, as they are unable to percieve us. To further this case, I then crossed the small bridge over the lava, heading towards the Shrine of the Oracle. There is a wandering craftsman nearby. In this instance it was a taskmaster. Upon approaching the bridge, the voltarie attacked her. Cloak was still active.
Conclusion:
Does this this prove that this is not a bug, or that the new hate list itself is a bug/unintended? No of course not. However it does demonstrate that the aggro from voltaries directed towards pilgrims is not generated as a result of transferance from the player character. On the subject of the Hate List more generally, I will draw focus to this in the most recent hotfix:
This is a very specific and targeted fix, not a complete change or, restoration to the previous list. Again this does not outright prove the cahnges were intended, but it does give further ground to the prospect.