You're not wrong, but I don't know how much of this actually applies to Lou. Lou definitely thinks in black-and-white, and he may indeed have been raised to think "every life is valuable", but that lesson is NOT something Lou has taken to heart.
Lou absolutely thinks some lives are more valuable than others, and doesn't hesitate to make his contempt for other people's lives know. What makes it particularly fucked is that the key thing for him - the ethical principle on which he operates - is the question "is this life convenient for Lou Gagliardi?"
If the answer is yes, then Lou is 100% behind the sanctity of life, and even a totally natural death can potentially get Righteous Crusader Lou looking for someone to blame ("this transwoman died of diabetes! It's the fault of... uhhh, capitalism!"). But if the answer's no, your life is not convenient for Lou, then you can get fucked; Lou doesn't care. In fact, if Lou suspects that your being alive inconveniences him personally, he'd be happy if you were dead.
(if the answer is "...maybe?", then Lou will go to the tiebreaker, and pick whichever side of the argument lets him be a dick to the other guy on Twitter.)
I guarantee you: give Lou this same exact scenario, but change it ever-so-slightly, so that the dead child was reading JK Rowling right before she died? Lou would be arguing the other way. In fact, he'd probably say the driver was a hero, and accuse you of racism/sexism/homophobia for suggesting his child's death was manslaughter rather than justice.