[quote=@NekoMizu]
[@ModeGone]
Technically wouldn't Chara be good above all else considering what you just said? Afterall they did kill the murderer of thousands of lives (albeit with the cost of the entire world's lives, but hey its those individuals you killed who're important, right?)
[/quote]
Chara on a Genocide path isn't good.  Not when they choose to destroy the rest of reality with your help.  Chara on a Neutral or Pacifist path may not exactly be evil either.  We only have what people say about some kid who died x years before the player came into the picture.  Memories can be colored by fondness, bitterness, or even uncertainty.

With how the story of the Fallen Child and the Prince has become something like a fairy tale it is possible that the events took place [i]entire generations[/i] before the present day.  To say nothing of how long it could had taken to build the Castle of Home and the City of Home, the town of Snowdin, the scattered homes in Waterfall, all the facilities in Hotlands, the hotel boarding Hotlands and the CORE, the CORE itself, and the city/castle of New Home.  It's possible that there's even more places that we just don't happen to see.  Places that Frisk may had passed while riding Riverperson's boat.  We don't get to explore Home City or New Home City.  We also know that Alphys was able to hide the survivors someplace out of the player/Frisk's reach.

Not to mention that the existence of Monsters was able to die down from Fact to History to Myth.  The only thing we're told outside of the Monster history and the opening story is "Legends say that those who climb the mountain never return."  There's too much we, the players, don't know about the events prior to the game.