He's not even going to deport the vast majority of the illegals. That was just a ploy to ensure the bigot vote.
If people really cared about what happens to illegals that enter the country they would encourage or leadership to build the wall, so illegals can be funneled into the system, and increase funding to the organizations that process the illegals. Most illegals get to stay in the country once they are processed. The only ones that don't usualy have criminal backgrounds or appear to have criminal mindsets.
The system has a humane ideology and is good at what it does, but it's too small, underfunded, and overwhelmed.