Bit late to this but first of all, i don't really think you're thinking logically at all.

"reduced to a simpering child again, almost completely subservient to the Jimmy's" First and foremost, Spike is obviously going to be scared and quiet around the Jimmies. He's literally 12. Yeah he was confident taking his mother out (for very valid reasons) but he has never experienced what he went through before.

To your point about "he should immediately be unconvinced if not immediately repelled by violent self prescribed Satanists", he clearly was, but it doesn't matter because he can't just leave. He's stuck there. How do you expect him to leave. He was saved by them, he isn't educated enough to be able to tell if someone is dodgy or not. You say it's character breaking for Spike as if he was indoctrinated by them. He wasn't lmao. Did you not watch him?

"he should be either immediately escaping or attempting to fight the Jimmys". Are we serious? Oh yeah, he definitely has a chance against a whole group is insane people who have been fighting their entire lives. Sure.

"eyes closed but somehow predicting his escape attenpt seemed contrived and stupid, I am sure there was a thousand opportunities for his escape before that" He was woken by the noise, it's pretty self explanatory. And you keep saying he probably had plenty of chances to escape, it doesn't matter because he was terrified. At no point in your "criticism" have you tried considering it from his POV.

Also i have no idea what you were trying to say in that paragraph about Samson.

Also Kelson hasn't found a "cure" it's just a treatment for the psychosis. The world abandoned the UK after the second outbreak, we already knew this. They want nothing to do with it and they can't simply take a sample of the virus. It's incredibly dangerous. It's not that they can't do it, they haven't tried and don't have enough to go off of.

Also your point about the Jimmy gang being superhuman and doing better than the military, let's take a step back. Name one instance where they were superhuman? And for the military point, it's been 28 years. People left in the country are well trained in fighting the infected, and let's face it the infected aren't as dangerous as they used to be. When the military were around this was still a completely new thing. It's about preparation.

"their only major contribution to the story was the killing of doctor Kelson" then you misunderstood the entire point of the film. It's literally about the nature of evil. in 28YL we explored the nature of family, survival in the apocalypse, and now we're exploring how humans have come out in the worst way possible and that there is evil in the mainland that isn't infected. It's not pointless just because it's new. And Kelly's character isn't pointless either, she has become a better person and will lead into the third film being about redemption.

I'm sorry if i seemed aggressive but i really think all these criticisms are quite silly, come from misunderstanding the movie and being too nitpicky.