Many people claim that his motives were "Unknown", even his own Wikipedia page does. However, he did not explicitly explain his motives for the shooting.
The most logical belief is that he did it to save the children of Sandy Hook. He loved children, and voiced his care for them. He most likely believed that by killing the children, he was saving them from suffering and being "raped" by culture.
Website work in progress. Last updated; 11.30.23