I really hate villian deku. It is akin to a tumblr oc to me. The idea of him becoming a villian is fine, but it is treated so poorly and tasteless, he literally looks like just another yandere onceler. I think it is more plausible that if Deku didn't become a hero, he would either become a policeman/paramedic, depressed salaryman, or kill himself. The only good point to becoming a villian is that he has a lot of hero knowledge and is strategic. Either way, Deku will always be a sweet boy.