User blog comment:Brendyn.robertson/Lelouch's a villian?/@comment-6192123-20181127003132

Actually, he planned to act as a villain, so he can unleash his plan, The Zero Reqeium. It's was all part of a plan to fullfill the wish of his sister Nunnally, and he couldn't be there, so he became the symbol of everyones hatred, so everyone can move on to happier future.