Here's why:
* Water's Actual Name: The chemical name for water is dihydrogen monoxide, which accurately reflects its composition: two hydrogen atoms (di-hydrogen) and one oxygen atom (monoxide).
* "Hydrogen Monoxide" is Misleading: While it does contain hydrogen and oxygen, the name "hydrogen monoxide" doesn't give the correct ratio of these elements in a water molecule.
The use of "hydrogen monoxide" is a playful way to highlight the potential for confusion and fear-mongering when technical information is presented without context.