I mean, ICE itself was founded in 2003, the concept of some immigration enforcement existing isn't crazy. And by changes I meant that it should get the regulatory oversight it should've received back then, a lot of these absurd immunities have existed for 20+ years and just never been so flagrantly abused, and the grand majority of its leadership (and a ton of its membership) should face legal consequences for what they've done, the laws they've flaunted, and the powers they've abused.
Really though, you're probably right, it may be better to abolish the institution and try again from scratch. I don't think much of anyone wants to see an ICE logo or officer ever again, and it might be easier to rip up the whole tree rather than try to prune it.