...but you're ignoring the principle that people are flippantly telling them, "If you don't like, just leave!", which is what brought about this discussion in the first place.
It isn't a realistic option when such barriers exist.
>People are literally dying to break into the country for the opportunity that these folks are complaining is inadequate.
This logic doesn't work. People are literally dying to get into the EU and people from the EU emigrate, yeah? If everyone believed in the exceptionalism of their own home country, then no one would leave!
Also, they're probably not complaining about the opportunity as much as other factors, like society (en masse [e.g.: American society, Russian society, Chinese society, etc.]).