There are multiple books written about each of them. At least in the context of the US.
> like school
We have tried dozens of ways to try and fix poverty through schools - with overall depressing results.
> neighbours
Also tried with no success.
> family as a whole
The overwhelming evidence suggests even lousy fathers provide better outcomes than the alternatives.
> public support
I'm not sure what you mean? Poor minorities have been supported for decades by various groups/segments of society.
> typically construction industry is under staffed in whole western europe and needs immigrants to work
How well does the construction industry in Western Europe pay? Is it on par with nursing, IT, law, accounting etc?
Any textbook on the topic will explain. This is not even controversial.
Why would we have to sacrifice anybody?
How do you define intelligence and how is it biologically inherited?
Why would those be the three influencers and not stuff like school, neighbours, family as a whole and public support?
Why would feminism have killed fathers at home?
Who said gangs are more accepted or that there is even more violence?
Can you prove how immigration limits entry jobs? Last time I checked entry level jobs are actually missing candidates in many developped countries because the local youth doesn't take them (typically construction industry is under staffed in whole western europe and needs immigrants to work).