Come on, the answer is simple.
The left understands to get them while they are children.
They started in the schools, it is called INDOCTRINATION!
Certainly that is a major part of the problem.
Another part is that these kids are raised by day care and others insteda of parents. Both parents working, and they try to make up for it by looking the other way and spoiling these kids into thinking everything in this country is free.
Teachers are brain washing them and later in college they have professional Communists and Socialists pushing Marxism to them. By the time they are 30 they begin to come around if they are smart. Some never are.