I didn't really read the whole paper but it seems to say that unless they are put into social services they are highly likely to engage into small/petty crime which confirms my assumptions.

What are you expecting people with no skill to do? Most likely they form their own "communities" with little to no integration in the host society. Maybe they will integrate after 1-2 generations or maybe never(see how gypsies communities "integrated" in Europe).

Why would you want mass immigration of unskilled people? What good can it bring? My opinion is that you either make sure you have the money and logistics to make them good citizens or reject them at the border.