It depends on whether or not you want to consistently hold your beliefs to their logical conclusions.
First, if you value human life qua human life, your reasoning and reasons are not significantly different from the same reasoning and reasons that racists have. You draw the line at a certain similitude of DNA, they draw the line at a certain similitude of DNA.
Second, if you move to potential capacity for personhood, you either must reject natural selection or make the very bold claim that no other species can have offspring that will develop personhood or extend your these rights to other species. As far as I can tell, it is possible that a new born bonobo will develop personhood, eventually. Why not today? Tomorrow? The theory of natural selection tells us it is more likely that such an ape will have offspring that develop personhood than not. Moreover, the theory makes room for the possibility that a cow has a calf that develops personhood. Unless we are not extending rights to cattle, based on the possible potential, I see no reason to extend it to humans based on the possible potential.
One might provide a generalization of humans and, as such, then say that all infants will develop personhood. But, this is simply false. The infants that have the potential to be persons are merely those that develop into persons.
Moreover, the fetuses that are aborted and the infants that are killed are among those that never develop personhood. All that can be made here is a potentiality claim. But, I'm not even sure what that means. It is certainly not equivalent to, "Left to their own devices, they will develop personhood". It is much closer to, "If they are fed appropriately and cared for appropriately, they will develop personhood". But, the use of "appropriately", here, begs the question.
I do not believe that sociopaths are persons, for they lack the sentiment aspect. Moreover, we do treat sociopaths differently under the law and within most moral theories. But, we also can claim, with a high degree of certainty, that many sociopaths are not born as such, but turn into sociopaths due to conditions of their early life, prior to the development of the capacity to experience sentiments.