How are you supposed to get a warrant for a person you can't even prove is who they say they are?
And I'm pretty sure the gestapo had uniforms.
Further, if someone is actively avoiding law enforcement, wouldn't you think it would make sense to not look like law enforcement?
Also, where are you supposed to send a criminal that is awaiting deportation?
I understand it doesn't feel good, but I know plenty of people that followed the process, and obtained citizenship legally, and you are all saying "fuck that, let's have criminals do whatever they want" because it doesn't feel good.
By your logic, you would speed down the road in your car, and when you got caught, it's not fair because the cop was in an unmarked car, and wasn't specifically looking for you.
Or just maybe you made the choice to speed, so you have to pay the consequences if you get caught?