I think two issues are mixed up here: 1) a man kills a girl in a traffic accident and runs away. 2) deportation.
I do not understand why he got such a light sentence for manslaugther, but presumably there is a reason. That is one discussion.
What has this got to do with deportation or not? Apparently the man lives here, has his family here. Where does deportation come into it? Should we likewise deport others to Australia or somewhere when they screw up??