You are indeed rambling.
The fact that people are atheists says nothing about the people who make this claim. They may be good, bad, tall, short, bald or full of hair. Atheism is NOT a way of life, it has no creed.
So people who do not believe in a god have done atrocious things, so have people who believe in a god. The difference is that very often the theists do bad things in the name of their god. Atheists usually do it in the name of power, control, oppression, etc.
If you go back to the original post it said "...Militant Sceptic…"; not militant atheist. You and other people have brought the word atheist into this discussion, I'm still talking about sceptics.
I went back to the original post. IT said 'atheist,' but that the writer preferred himself to use the word 'skeptic,' it was quite clear that 'atheist' is what he meant. His definition was that it meant anybody against the bible and spirituality...and that covers all religions and beliefs in deity or 'higher power,' organized or not.
Which of course leaves...what, precisely?
So the reason the readers here have just cut to the chase and said 'atheist' isn't us 'bringing the word atheist' into this conversation. The OP did that. It simply shows that we aren't stupid.
The truth is, just as 'atheist' is a term that is a reaction to 'theist,' then when an atheist does something for the purpose of harming, or getting rid of, theism, he's doing it FOR 'atheism,' whether he says so or not.
He may say he is getting rid of religion 'for the sake of reason,' or for 'the good of the people,' or whatever, but getting rid of religion and spirituality leaves....what, precisely, again?
As for the core REASONS, they are the same as the core reasons theistic leaders really do what they do. Power. Control. Those reasons, at the bottom of things, are always about power and control, whether we are talking about the Crusades or Mao's 'great leap forward."
The only difference I see is that theistic leaders have to take an existing religion and manipulate/twist it so that they can make their followers believe that God approves of whatever is happening.
Atheistic leaders don't have to do that, and so can skip a step in committing atrocities. As well, theistic leaders, if they are 'true believers' believe that they, too, are going to be judged by a 'higher power,' and have to convince THEMSELVES that they are 'righteous' as well as their followers. (shrug) Plenty of them have done that, of course, but it is one more step that they have to take, especially if the religion they are twisting around does not, in its basic teachings, allow the sort of atrocity they are planning.
Atheistic leaders, of course, are accountable to nobody 'higher' than they. There is no eternal punishment awaiting them, so...why not?
On the other hand, if a theistic leader doesn't believe in the religion he's using, then--that's a whole 'nuther problem for atheists, isn't it? Talk about a cold blooded misuse of power!
The very bottom line is this: there is NOTHING about atheism that would make the world better if religion were done away with. Absolutely nothing, as has been proven rather spectacularly. There MIGHT be something about some theistic beliefs that can, but only if the adherents actually, er, adhere.
The one thing I have noticed in my study of history is that the vast majority of atrocities committed 'in the Name of God' were done by people who weren't paying much attention to the teachings of the God Whose Name is being used.
And atheistic leaders don't even have to bother with that, except to blame religion for the woes of the country, and claim that getting rid of the religions (and the religious) would cure all ills. It never has, but hey, let's not let facts interfere with a good argument.