I really wonder how you got that impression.
I saw Democrats funding 'cop cities', and paying for police to learn their tactics from the IDF. I saw Biden proposing increasing police budgets by $1.7 billion dollars (after months of global BLM protests). I saw Obama, Biden and top Democrats happily voting to fund ICE, and boasting of deporting more immigrants than any other admin in history.
Republicans to police: "Shoot criminals dead."
Democrats to police: "Why can't you just shoot criminals in the leg?"
... That's not what an "antithesis" looks like.
If you want real reform of ICE and the police, and expect to get it from Democrats just because they say they will, then you're gonna have to keep ignoring an awful lot of inconvenient reality.