I read a huge (700 page) book about Napoleon and it described how he would win battles by using his forces to charge directly into the enemy strongest point on the line in the battlefield. It also gave description of Napoleon going to the battlefield after the fighting was done and being interested in all the gore that he helped create.
I would argue that he hated death but rather had a strong interest in preserving life. He worked hard to ensure (at least his Imperial Guard) had good medical attention as well as understanding that needless death would have worked against his own strategic goals. This idea of Napoleon feeds into the "Napoleon the Butcher" trope that's over done and very incorrect. May I know what biography you read?