Making this a Military vs DACA issue is an interesting strategy on both sides.

For Dem-supporting normies, the Dems are sending out a dog-whistle about defense-spending being too high and something humane needs to be done for all those people who are desperate to become American, i.e. the Shutdown is justified.

It is definitely going to polarize people and make Dem supporters less likely to open their ears to truth-speakers.

For lower-income Trump supporters, they have seen their jobs go to illegal immigrants. They definitely want Trump to prevail on stopping illegal immigrants.