Why not formalize it by saying one should lose citizenship automatically under these circumstances? If you don't agree with that, then realize you are drawing a line somewhere, and deanmoriarty is merely drawing the line in a different place. Both of you are the same, and are merely quibbling with the degree by which you are the same.
For practical reasons. It's hard to formalize and having people be stripped of any citizenship is shit. I don't mind the idea of losing your previous citizenship once you acquire a new one, that's fine.
I'd much prefer a system where education etc is fundamentally free but is converted into a loan if you emigrate. Society X invests into you, you want to jump ship to Y so you pay back what X invested into you, possibly in multiple installments or an additional income tax.
One more question for you, to understand the scope of your philosophy: I don't plan on having kids ever, and to be honest my reasoning is partially driven by the fact that I see them as an unnecessary financial and time burden on me and my partner (she agrees).
Does that mean that in your world view we don't deserve a place in society at all, because if everyone was like us we wouldn't have a society at all in a few decades, so once again I am living by exploiting all the financial and time commitments spent by other people in raising other humans for my benefit?
I'm also not against suicide, even though society would end if everybody did it. It's about your interaction with others where your morality matters. Whether you have children or not is your personal decision and is up to you, similarly to burning your possessions. It's when you're contemplating to burn other people's possessions that the do/don't questions arise.
I know plenty of people in the EU that work in IT, get paid very well (compared to their peers) and do not work in a consulting company. Especially for very talented people, I haven't heard of any stories about not finding interesting, fulfilling work.
> 3) Move to the US, keep the EU citizenship, but completely deny to myself the option of eventually moving back, so if I get a massive debilitating cancer that will force me to quit my job and lose my insurance in the US, I'll die with morals.
Since you renounce your duties to the society that gave you your free education and upbringing, renouncing the benefits sounds fair, yes. Living and dying by your personal convictions is what I respect in people. Living by them only while it's convenient and stopping to do so when they get tested just means that you don't actually have any.
> 4) Move to the US, keep the EU citizenship, keep the possibility of eventually moving to EU, but to be consistent with my morals find a way to donate to my EU government a few hundreds/thousands a month to keep contributing to the social safety net (I don't believe that's even possible for non-residents).
That's another option, I'm sure you can find a way if you want to.
I don't mind the emigration part at all, it's the reasoning I dislike. Saying "I don't like the bureaucracy" or "I don't like the population density" or "I don't like the language/food/culture/tv program" etc, that's perfectly fine in my book. But saying "I've taken all I can, it's time to move on, otherwise I'd have to give back. Oh well, I might come back if I ever get needy again and there's more to take" is not in my book. Living in a society that finances your education and catches you if you fall comes at a cost. Ducking out when the bill comes isn't what I'd do.