So, why do the Dems want people from sh--hole countries?

There are two reasons; one obvious, the other is not.

Jennifer Palmiery of The Center for American Progress had given away the secret: the Dems want these people as new voters for the Democrat Party. That is how they conquered California.

1. The first reason the Dems want these people is that they are (and will be) dependents of the State and thus will be beholden to the Democrat Party (their benefactor). They do not care if the Dems sell us out to the Muslims, take away our freedoms or ruin our economy with Socialist schemes as long as they are given their benefits. Since they can not speak English (nor are they encouraged to learn),  it is assured that they will remain outside the normal economy.

2. The second reason why the Dems want uneducated people in the country is to reduce the earning potential of low trained blacks. That way the Dems can continue to rail about racism being the cause of income disparity.