Final Straw for Lovecraft

I ponder Lovecraft more than I should. His life, his failings, his accomplishments. But one thing that nags at me is what drove him to write horror. I've read how the death of his father and grandfather and subsequent move affected him. Change is hard, especially for a child, but what was it that made him dive into horror? Its likely a list of things, just as events are often the sum of their parts rather than one action. I would like to hazard that it's frustration with himself to be unable to make a cohesive picture of his life.

He was obviously into gathering information. He tracked his ancestry by several generations and kept journals of the stars. But he also dropped out of highschool. It's as if he's leaning toward things he loves more than the average general education. Like most artists he took his pain and made works that haunt us to this day. I doubt he would consider himself an artist, he'd likely prefer to be known as a scientist or a famous author. The amount of information he took in from star clusters to family trees must have been staggering. In my research, I'm grapling with the vagueness of his lore. It's as if Lovecraft's search for knowledge took him to the edge. It's human to want understanding. Why did the vampire attack? Why did this death happen? We want answers but Lovecraft almost taunts us by saying we won't get them. But tell me Mr. Lovecraft, what drove you to the edge? What caused this?

Without the man himself, I'll have to make my own guesses.