Good people in DnD are not "good" in the modern sense. At the core every adventurer is a sociopathic murderhobo who has different targets based on presumed morality and a graverobbing hobby. There is not much difference between them for a modern human being. But hey, it is a game and fantasy so don't worry. Pixels can't feel real pain. (If you want to get into the racial determinism with Gnolls being made by a demonic being and Orcs, Goblins and Drow almost always worshipping evil nutjobs you can open a can so big it could fit all murderous liches and the whole Illithid race inside so it is best to just kill a bunch off pixel kids and not got there).

Solo kill list: One stupid evil (displayed alignment) Githyanki warrior, a dark grove, a Zhentarim hideout full of "experienced" rogues, half a Goblin camp including two hobgoblins, two minotaurs, a bunch of underworld monsters and their wannabe sorcerous overlord