Thank god I'm not the only one! Chris had the better mom and yet turned into a crazy person. Madison is so frustrating. All her focus is always on Nick, it's like she forgets she even has Alicia just because Alicia is smarter and more grounded than Nick. Alicia is definitely bruised from losing so many people and feeling so abandoned by people like Nick. So she definitely needs some fun and to keep some of her humanity and goodness.
As far as Alicia is concerned, okay yes Negan kills people, but who doesn't in this new world? Rick's lot killed Saviors first. And Negan is good to those who are loyal to him, they get good food and amazing protection. Obey the rules and you live well. She's seen so many worse types, like Celia and her worshipping of the dead, the gross frat boys who killed Chris, the pirates who kidnapped her, and my headcanon other assholes along the road.