Earlier quoted context omitted.
No, because then you have no one to do manual jobs because the native well educated youth won't take those.
>then you have no one to do manual jobs And that's fine, because those jobs can either be automated, outsourced, done domestically (ie. driving yourself rather than getting delivery), or at worst case paying more. All things being equal I'd rather have a chemical engineer who can do chemical engineering and deliver pizza, than someone who can only deliver pizza.
- not all jobs can be automated
- manual laborers make less money
If you see immigrants all around you doing great, while you clean toilets and struggle to feed yourself, that breeds resentment of your government.
And sure, it's easy to say the jobs should just pay more, but that's not the reality today, and if your choice is working a shitty job or starving then that's not really a choice at all.
I would also rather have the chemical engineer, but I think it would be even better to live in a society where both the delivery driver and the chemical engineer are net positives to society.