Here's an example of why I think the comparison is meaningless. Grand theft can be charged as a misdemeanor with up to a two year jail sentence. But Brock Turner was sentenced to only six months of jail time for rape. Do you think grand theft is worse than rape? Of course not, but the problem here is the Brock Turner sentence, not the sentencing for grand theft. This question could only be posed because, by design, I selected a more serious crime (rape) for which there exists at least one case where an inappropriately lenient sentence was given out.

You did the same. By design, you selected a more serious crime (murder) for which there exists at least one case where an inappropriately lenient sentence was given out. You then used this highly dysfunctional example to draw a comparison to the less serious crime. But the simplest response to your question comparing crossing the border and murder is simply that the affluenza sentencing was wrong.