I think you want atheists to think deeply about their ideas but I think you fail to grasp that although people will decide that there's no god for such-and-such a reason they don't have to, or want to, or feel the need to think further than that. I also think you are treating atheists as a homogeneous group when in fact, they very much disagree with each other all the time and they came to their ideas from a million different experiences and life events.
I don't expect all Christians to believe the same thing, and Indeed they don't because different sects believe different things. Same with Muslims, Jews, Hindus and Sikhs. I check myself constantly when making assumptions about a person from a certain faith because I think it's offensive. In the same way OP, I find your assumptions of atheists to be offensive.
"Worldviews have consequences". Well yes, they do. Shall we look at the Zionists in Israel for evidence of that? The Islamic State? Maybe Modi's nationalist government in India? Maybe we should look at the Iran's oppressive regime, or the unstable peace in Sri Lanka?
Maybe we should borrow ideals from the USA which was founded on secular ideals (but subsequently got consumed by Christian influence)?
The problem is not religion, or secularism, or atheism, in my view. It's human beings. Humanity. We do crap things to each other because we can. And will. And because we are self-destructive as animals, we will continue to do so, if it means there is self-benefit.
Finally I think your demands of atheists to explain their beliefs & defend them is ridiculous. Some atheists still consult their horoscope. Some atheists wonder about if there's an afterlife. Some atheists dabble in the occult or volunteer to be a godparent. Well, so what? That's got nothing to do with you or anyone else! Atheists sometimes have to negotiate families or societies that are still steeped in religion or religious expectations. Sometimes doing certain things is fun. Sometimes, well, just because. Sometimes apostates have to keep quiet about their atheism or lose their family and community. Atheists do not have to justify themselves, especially if their views could land them in trouble. So I think you are wrong. (Sorry for the essay)