Let's be logical. Negan wasn't the bad guy when he killed only two people from Rick's group, just after they killed a bunch of people from Negan's group for food. Both of them are crazy and sadistic. But Negan was only defending his people because stealing half of others' belongings was to keep alive the hundreds of people under his care, and he still left alive the majority of Rick's group.
In an apocalypse, things aren't fair. But Rick DID kill an entire post of innocent people for food, and Negan only reacted back. He isn't a bad guy for having his people fear him so he could stay in power. You don't stay there by being a softie, and he did help all those people survive for a long time, meaning his way worked.
Negan is not a good person for the girls he kept for his own pleasure. People don't hate him for being a misogynist but for barely having revenge. I loved Glenn, but it's not like we get to choose who lives or dies.