Deported 20 times??

TV news is pushing a terrible story of a lowlife that was deported twenty times and now has murdered someone. This should never have happened.  After deporting a guy a couple of times, we know that deportation doesn't teach him anything.  Should have given him five years in jail back about deportation #3 or #4.   Do we just deport them time and again because it's easy to do and fairly low cost compared to a US jail?   Not good.  After a reasonable number of deportations we know this guy is trouble, letting him loose on the other side of the border is not right.   A good solid stretch in jail might get the message across, and at least will keep him off the streets.