So, my guesses about what's going on. The village is selling something illegal (drugs?), MC's parents somehow either knew about it and wanted to turn it in, or were involved in the chain, but became inconvenient. And they had an accident. When MC grew up, he started to unravel it somehow and killed everyone he found in the chain, then moved to the village... not only to hide, but also to feel them out. Something like that?
So, my guesses about what's going on. The village is selling something illegal (drugs?), MC's parents somehow either knew about it and wanted to turn it in, or were involved in the chain, but became inconvenient. And they had an accident.
When MC grew up, he started to unravel it somehow and killed everyone he found in the chain, then moved to the village... not only to hide, but also to feel them out. Something like that?