According to the WHO, malaria kills almost 500,000 children under 5 each year globally, though the vast majority (~90%) of these deaths are in Africa. [1]
In the US, 3,000-49,000 people die each year from the flu.[2]
"Influenza occurs globally with an annual attack rate estimated at 5%–10% in adults and 20%–30% in children. Illnesses can result in hospitalization and death mainly among high-risk groups (the very young, elderly or chronically ill). Worldwide, these annual epidemics are estimated to result in about 3 to 5 million cases of severe illness, and about 250 000 to 500 000 deaths."
Not to mention, we can eliminate an extreme majority of malaria deaths, and we can do so at a relatively low cost per person. Something the parent is ignoring entirely.
http://www.who.int/mediacentre/factsheets/fs211/en/