Yes. Those are examples of science being done unethically. Science itself is a process that is ethically neutral so it can be used in both good and bad ways. That doesn't make it unethical by nature like the original post claims it is.
Yes, humans tend to explain things they don't understand using myths. And yes, humans have historically used those same myths to explain morality. How does it then follow that religion and spiritualism are required for morality to exist?
I get where you're coming from. I used to think the same thing. I don't anymore and I would urge you to look more into subjective vs objective morality. Alex O'Connor has some really good thoughts on the matter.
That's what other federated services like Matrix are for. Maybe there could be an ActivityPub chatroom service but Lemmy is not and will never be that.
I think one of the best phrases I've heard from the atheist community is "Do No Harm". Very similarly, the Golden Rule, which almost every civilization has a version of, says "Do to others that which you would have them do to you". Beyond that, there are no rules one must abide by. If you would wish others to stand up for you when you cannot, then do so for them. If you wish that people would help you when you are in need, do so to them.
Ultimately, you create your own meaning from the little things you find joy in and if you follow the Golden Rule then you can help others do the same.
Is this loss