Your first sentence already showed your lack of 'integration' with Singapore and our politics even after working here for so long. Aiyah, it's a joke that only locals understand anyways
I'm not questioning the reasons why you left your country but rather emphasizing on the motivation and comparing it with why locals have the similar motivation when switching jobs.
Anyway, for those who studied overseas, if they come back and contribute to the economy after graduation, of cos they will be perceived as loyal citizens.
And people migrate overseas because of one simple reason, they feel Singapore is not as good. If not why migrate?