However, he is not without mercy or reason.
He wished to destroy Earth because its inhabitants were too deep in their darkness and were evil, and even after seeing MegaMan defeat his darkness after Duo drew it out from him, Duo stated that MegaMan hadn't destroyed the darkness, just suppressed it, making him deem humanity still too evil to leave alone. Duo is a perfectly neutral figure who goes purely on logic as he judges other beings from their planets, whether the species or race is good or evil, the latter of which would lead him to destroy the planet, as his primary mission is to destroy all evil in the universe.
