Now the network itself is unreliable. You can carry on impersonating the morons to announce your own false alarms, but even the "real deal" is fucking things up now because it's got trolls on the inside.
Once this happens and gets widely publicized just once (which you can't stop thanks to the internet), no one will trust these "observation and early-warning" movements ever again. Once people realize how easy it is to fuck with it, it won't be worth the effort and people will write the whole thing off.
ICE will experience maybe a few weeks of inconvenience through this retarded act of protest, then get a boost because people warning their targets in advance will in fact cause illegals to shrug it off. And the entire process will be really fucking funny.
All because the left has no sense of humor and cannot conceive of their own "disrupt from the inside" tactics can be trivially used against them.