I think you mean central points to the story? Also, do you not know how propaganda works?
Yes, I'm very familiar with how propaganda works, which is precisely my point. Propaganda filters out the negative detail in order to maximize the message in favor of the cause. If you were creating propaganda then you'd be unlikely to write the narrative as it's presented in the gospels. The very fact that Simon in the OP can point out the negative aspects is actually unwitting testimony to the honesty of the accounts.
For sure, it's no proof that these things happened, but it certainly adds weight to the idea that the authors believed in the things that they wrote and they weren't just going all out for telling a story that would best represent their cause.