At the end Marvin says the tattoo on his arm says "Bam, ... the name my mother called me". So, there's a chance that among her own psychological issues she just

At the end Marvin says the tattoo on his arm says "Bam, ... the name my mother called me". So, there's a chance that among her own psychological issues she just doesn't remember him by the name of Marvin. I couldn't possibly understand the family dynamic these people lived, but this all supports the notion that prisoners like these need help. .. not death