No reason to put any points in it at the moment. If I had to speculate I would guess that this passive may get a makeover and become useful when poisons are introduced.

To amend ... I have a feeling this hasn't been fixed because there is little to no reason to fix it. There really is no reason to craft potions with negative effects in the first place. With the correct ingredients, you can brew any potion you really would need with nothing but beneficial traits. The only time I every brewed potions that included (or were exclusively) negative effect was to get rid of excess ingredients and/or to level Alchemy. With Alchemy at 50, I hang on to the negative trait laden ingredients only in hopes that poisons will be introduced sooner rather than much later.