I wish I could have just wrote a few lines and stated everything simply but I don't know how to sum this up so fast.
you don't have to be religious to be an ideologe. I don't think believing objective evidence to be the highest ideal of truth saves some atheist from falling into the same errors that some religious fall into. maybe most atheist are a kind of empiricist. I say empiricist as opposed to the wider category of experiences a human is capable of having and also as opposed to pure reason or logic.
honestly I was hoping for a bit of self-criticism from atheist instead of the whole "nah, we don't got those problems. only other tribes do." response. now I have to fumble around with atheist since they won't criticize themselves. I find it much easier to criticize the religious.
yeah I think to some degree it is apples and oranges. I do think that atheist as a group are not generally as strongly united together due to atheism being a simple thing of "no belief in a god" as the defining term even though this already seems to imply certain possible qualities.
I don't think atheist are immune to human problems since the problems you described are to some degree biological programming. it's hard to not be controlled in some measure by systems that have existed for millions and millions of years. I think that almost all humans are biased towards what they think is true because from a darwinian perspective knowing and living in what is true can mean evolutionary success.
since you hold different beliefs than the religious you will tend to express those problems in different ways. your demonizing might be more subtle due to the beliefs not being as offensive i.e. burning forever in hell is pretty demonizing compared to scoffing at people who do not have the same kinds of philosophical mindsets that the typical atheist has.
I think that one advantage that atheist have is that it's often based in modern, rich first world countries and so you will tend to not be as barbaric as say a muslim that lives in a crazier part of the world. this applies to the religious living in modern rich first world countries as well.
since atheist don't believe in the religious domain then I guess I would have to consider what atheist in general hold up irrationally as a god over humans and the biggest elephant in the room is government/politics.
I know I can't expect people to watch videos that I link but this guy explains why government is a religion.
p.s. "duty" is part of a personality trait that some have more and some have less of. duty is a biological survival mechanism. I guess God is a powerful agitator for duty but if atheist feel threatened then that is all they need because for many a fear of pain or punishment and an authoritarian sense of what is good is the root of this overzealous sense of duty.