Once again, I can not quote you
I mostly agree with things you've said. I'd just add that I think that feeling that something belongs, or should belong to you actually is a natural feeling, rather than just our illusion.
Also, I don't think belonging and being a part of certain group is bad. That's how we survived right? Thr problem is when you limit yourself to one group only, and only pay attention to thay group's needs. Therefor, patriotism isn't bad to me, as long as it's loving and respecting your country, without seeing others as less worthy or inferior in compare to you.
Nationalism? Yup, we're going backwards, interesting things are about to happen, and it will become a nightmare if we all remain just a plain bystanders.
I will admit that I might be wring about many things, I am pretty young.