You will see on this thread people with similar politics but saying different things.
He should not be punished for anything connected with his release. He did nothing wrong. Then.
It is what happened that got him banged up that causes the quandary.
He was sentenced and must serve his time. As you say, what signal does this send that if you are an immigrant and commit a crime, being sent home to mum in a state funded flight is an option.
But instant deportation is also attractive. Gone, banished, never to return. Why should our taxpayers spend the fortune of keeping this rat safe in custody?