We have a system that promotes parasites for sure. 

If you give people a stipend and free room and board does that promote the incentive to be productive? 

If local law enforcement refuses to work with immigration and customs, do they promote lawlessness?

Yes and yes 

Bell_curve

>third world nations have very few productive residents

How do you know? How many have you met? Is it that they are not productive or they are easily satisfied with the social safety nets of richer countries? I believe humans react to incentives. When the system incentives people to be productive, many people produce. In the contrary, when the system incentives laziness and parasitic behavior, many people become parasites. 

"Show me the incentive and I will show you the outcome."

gnilma

Stacker Saloon

saloon

Your romanticized theory of third world immigrants ignores something crucial: third world nations have very few productive residents 