Board Thread:General Discussion/@comment-12190640-20180129033252/@comment-27136653-20180203223126

This is the only correct interpretation there is. No other makes sense. In the genocide route, Chara is nothing but a complete and absolute manifestation of the player stereotype, without a personality, and without any higher goals or greater desires. They're doing it because you are, and you are doing it because you can.

Toby even indirectly confirmed it with the following email: https://redd.it/7ov4j8