In France the problems is with the 3rd generation immigrants from our ex North / Central African colonies.
The 1st generation came to work (or to flee like after the Algeria independance war), they settled in pretty well.
Their kids, the 2nd generation for most of them integrated well, went to the school "de la République" and most found a job.
The 3rd generation arrived at the wrong time, unemployment, failure to integrate in France, but being foreigner in their grandparents country, being ostrazied for employment and in daily life, many ended up hating "La République".
A perfect breeding ground for the Islamist recruiters, financed by some MEA countries. Or for drug importers looking for foot soldiers.
France's successive governments being completely blind and at lost how to react except by harsh police repression.
Oh, and you can't kick them out as they are French, and not even bi-national anymore. They need a visa to visit their grandparents country !
Even if they kill somebody you can't take away their nationality, as they have only one, and the rules don't allow to make somebody stateless.
Regarding 1st, 2nd, 3rd, I assume you are referring to individuals whose grandparents migrated to France many years ago.
If that's the case, you haven't accounted for those who journeyed by sea and reached the distant Greek islands like Lesbos/Lesvos, Samos, Chios, Kos, and Leros.
In the context of Italy, they disembarked on the island of Lampedusa.
However, they might find it economically unfavourable due to the scarcity of economic opportunities and social support, prompting them to venture even farther such as to Scandinavian countries, Germany, Holland, France. This process could take years. Not even in France a safe and relatively good benefit systems are they economically satisfied until they can make their way to the UK using small boats from Calais to Dover or hiding on the back of the lorry. The EU regulations dictate that genuine refugees should seek asylum in the first safe country they reach, raising questions about the motives of those who choose not to do so.
The current surge in far-right movements is unsurprising, given that it is their money from the taxation that have been utilized to support these systems. In the UK, for instance, a total of £8 million per DAY is expended solely for accommodation of these individuals in three-star hotels. Ironically, the people who are paying tax, need to live in the tent as she can not effort to pay the rent in London, like this:
Higher education is one of the most casualised sectors of the UK economy, and for many it means a struggle to get by
www.theguardian.com
Other unaccounted benefits include free healthcare and education, weekly allowance without contributing to the system.