I think it’s a conglomeration of interests. Their Asian societies they come from are extremely stratified and class based which lends well to the class warfare the left thrives on.
Also they believe they are superior to most the minority groups in the cities and realize that most of the dependent hoards are gonna need taking care of through government help.
They figure why not let the government take from everyone and spread it around to the lesser groups of people so they are satiated.
Then there is always the us versus them - color vs yty thing that’s so prevalent nowadays.
I think the biggest factor is social issues. Specifically the (irrational) fear of "Bible-thumpers". Even though these societies are fairly pro-marriage and anti-gay rights.
Asians do seem to favor abortion by a wide margin.