The US Military is still loyal to the constitution ... so Trump had to create his own army of brownshirts who will do his bidding in spite of the law, in spite of the courts, and in spite of any human decency. ICE has to go - forever.
I would argue that the case for dismantling ICE has, at this point, virtually nothing to do with larger questions of immigration enforcement and reform, it's just clearly incompatible with a free and democratic society to maintain a secret police force with sweeping and arbitrary authority.