Ok so y'know how some people assume that Scar probably was already evil prior to the snake bite?
Well... TLK 2 established that Scar already had some form of darkness within him. And given it's the same continuity... this actually would add some merit to the idea of the venom's neurotoxin not being what turned him evil, but rather just either amplified the worst aspects of himself like Kion, or was the final straw and what finally pushed him to fully become evil.