Board Thread:General Discussion/@comment-30088034-20170211001105/@comment-26233737-20170211152714

Chara wanted the humans dead, as shown by Asriel's dialogue when you find him at the beginning of the Ruins. It is heavily implied that Chara wants the monsters dead since they encourages the protagonist/player to keep killing. "HP. ATK. DEF. GOLD. EXP. LV. Every time a number increases, that feeling... That's me". And she only controls you in the genocide route because you gave her the strength to do so. Also, Frisk automatically moving towards Photoshop Flowey before his fight may be Chara moving Frisk.

So yeah, Chara is evil. How is that so complicated?