He was released from the traffic stop because when local cops contacted immigration, they either didn't have anyone to send or just didn't want to deal with it. That doesn't mean he's innocent of the crimes he's now being charged with, does it?
What do you think would happen if word got out that you could come to the USA illegally and that if you got caught, they would just let you stay and put you on the path to citizenship? How are you not advocating for an open border policy by saying that?