They just claim every single action of immigration enforcement is "inhumane" and "splitting up families."
They just want to abolish ICE.
They just want a "dreamer bill" which often is a code-word for hidden amnesty.
They just want an end to all deportations.
They just want anyone caught at the border to be able to claim refugee status, and effectively disappear after that date.
They just are fiercely opposed to any immigration enforcement by non-federal authorities. They will claim it is due to the rule of law, but in reality it is because local authorities would be more efficient.
No, they do not want open borders. They just want to provide a framework that makes immigration policing impossible, both in border protection and interior measures.