You link to an article that is "We Found That More Than 170 U.S. Citizens Have Been Held by Immigration Agents. They’ve Been Kicked, Dragged and Detained for Days." and which has reporting inside that describes the 170 cases of ICE detaining citizens.
Note that detainment is more severe and different from the harassment of the 9 that you somehow claim refute Kavanaugh stops.
But even if the article were as you incorrectly describe it, it would be fallacious to say that because a single article doesn't describe something, it doesn't exist! That's a critical thinking and logic 101 error. And far far below the standards of HN comments.
Yes, there may be more of them, but in this particular article that was the most that they could find, and they were clearly trying to find them -- they even include 130 stops that they themselves say are of people who were obstructing or interfering with ICE operations. This is not good, but it's a pretty far cry from bystanders being harassed on the sidewalk for having an accent or the wrong skin color.
Link me a better source that describes or accounts the number of these stops and I'll update my comments and move my priors appropriately.
Sudden changes cause too much chaos, and you don't always know what works until you try it. Avoiding entitlement abuse is always going to be part of the conversation, and it seems to me the fix for this (and nearly any other issue) needs to be approached carefully from both the supply and demand sides until what's effective is more clear.