OK, in the original HorrorTale, Sans went made due to a lack of food, and nearly getting killed by Undyne,who CAUSED the food shortage. What drove Horror!Lav insane?
I’ve been thinking about it a lot and even i’m not 100% sure- feel free to give me suggestions but-
Perhaps Lav’s views on life suddenly flipped on him- like he was exposed to so much death, destruction, and sadness that he just kinda snapped and realized that life might not be as precious as he thought
Maybe all it really takes to set Lav off is a good’ol Genocide run ¯\_(ツ)_/¯