Deporting itself isn't bad. Deporting immigrants that contribute to community is bad for everyone.

An important piece to handle this right is to have enough immigration judges that can determine who should be deported and who is allowed to stay. US historically has shortages in that area. During Biden a bill was about to pass to address this and many other issues. It had bipartisan support, everyone thought it most likely will pass, until candidate trump stepped in and basically made Republicans not vote for it, because he needed the immigration crisis.

One, it could be used for campaign (see, we now already see immigration caravan, it is like a clockwork, always right before elections), two, expanding ICE and converting it to personal army wouldn't have buy in.

Now we have masked larpers going after old, women and children, like in Nazi Germany, they even built concentration camps (note, I did not say death camps, lookup concentration camps in dictionary, it is exactly that, people are confined without access to courts).

And as in Nazi Germany the group of people that ICE will go after will gradually expand.