Indeed, here you need one introduction, and it is that just because one is made deficient in perfection one may not say that it is actual negativity, because there can be deficiency, that even though it is not perfection and complete goodness is not negative. Can you not see, the angels are also certainly deficient, for they are not on a perfected purpose, for there is no perfected purpose other than to the Master may He be blessed, and amongst them they have several steps and levels, where the second level is lower than the first and more deficient than it, and even so they are not in sure great deficiency that there would be borne within them actual negativity, for there is not amongst them jealousy or hate, they have no inclination for evil within them, they have neither sleep nor weariness, and no illness or death.
But people are lower than angels and more deficient than them, and the deficiency within them is so strong within them that it is actually actually negative, for they have within them an evil inclination, they become sick and die. And animals have even more deficiency, for they have neither intellect or speech, and they are filthy and unclean. And there are demons and angels of destruction, and spirits of impurity which are actual evil, and they are the actual opposite of good and perfection, those that the heavenly Name blessed is He conceals from them a complete concealment, as per the reason in (Breishit Rabbah 3:6, Midrash Tanchuma Tazria 9, see there), "The Holy One blessed is He does not set his name aside upon evil".
And indeed the chain of deficiencies is what brings out negativity, for when this matter is extended, and deficiency is added to deficiency, in the end actual evil is born. And prior to when the Master may He be blessed innovated the existence of his divine interaction that was innovated for the needs of the existent beings, there was not matter of any deficiency at all, and when he innovated this existence, it comes out that he innovated the existence of one order though whose extension is born negativity, for since there is existence for deficiency - its end will be actual evil: