People act like jobs are a non-renewable resource that, once filled, that's all you get. This is a total misunderstanding of how consumer based economies work. Economic activity is demand driven. More consumers = more demand = more jobs. This is obvious if you think about it. It's why cities can exist rather than collapse once hitting a certain population because all the jobs are taken and no one can work anymore. It's why you find way more opportunities in cities rather than podunk rural villages.

Where the trouble comes in is that the population growth and job opportunities growth doesn't necessarily happen at exactly the same rate at exactly the same time. There can be pain in the transitional period between when the population growth happens, and when the new demand stimulates the new job opportunities. That isn't a reason to try and stifle the population growth. It's a political issue. Something like universal basic services (or UBI), or a universal jobs guarantee where the government puts people to work on infrastructure projects (social housing in particular seems like a good idea) or the like, like New Deal era USA did until they can find something more to their liking would do a lot to soothe that pain.

Ultimately, the new economic activity that's created from the growth is a good thing and ought to be embraced.

Clearly your country's immigration system isn't labyrinthine and bureaucratic enough. Add enough systematic hatred and anyone can be turned into a burden to society.

Here in the Netherlands, immigrants are not allowed to work, so everything has to be provided to them by the state. The construction industry has been regulated and defunded so that building houses for the lower class is never profitable and is only built through quotas that are too low to meet demand, leading to immigrants competing with locals for extremely rare housing, leading to abuse victims being forced to stay with their abusers or go homeless. They are not taught the local language and children have to go to segregated schools to prevent them from forming attachments. There is an army of bureaucrats, cops, lawyers, judges, and public defenders involved in determining whether they have the right to stay, regulating how they live, enforcing how they live, litigating how they live, appealing litigation, and going after immigrants who are required to leave.

Exactly. If capitalism was great at using all resources effectivly, then it clearly means that there should be no unemployment at all. After all it is a waste of work time.