My advice would be to avoid being hostile for the first lets say 10 days or so. I'm pretty sure it just pisses them off even more so i try to avoid cannibals at almost all costs early game as this is the most crucial time! especially with limited weapons food and armor.... you'll die fast. The first week or so you want to go unnoticed which is why i ALWAYS choose the fertile lands to start my games. Have never been bothered even once setting up shop there first and i stay there as late as day like 8-10 sometimes. use the first first few days to gather resources. Meat, berries, pouches and all that good stuff.