Ishi the last "wild Californian Indian" came out of hiding in 1908 after a group of men came across his hiding spot and killed his elderly mother. She was weak and was sleeping wrapped in some animal hides. The men found her and threw her off a cliff. Just unprovoked casual murder.
It's actually arguably worse. The settlers ran into Ishi's camp in November, which as I understand is pretty cold in the California mountains and about to get colder.
His mother was too weak to run away with her son. They literally met her in her blankets, unable to move, and she told them in broken Spanish that she was
muy malo.
Then the settlers took away all their winter supplies, including the acorn, the dried salmons, the bow, the arrows, the fire drill, the deer trap, the spear, the baskets, the moccasins, and the fur robes. They took away everything Ishi's family had,
as his mother was watching. Why? "Anthropological interest."
Ishi's mother died of exposure a few days later.
At least murder is... if not understandable, at least imaginable. The kind of mentality that makes you steal everything that an old and visibly ill woman has ever possessed for "anthropological interest" and leave her to die is simply unfathomable.