Why is ethanol not an oxidizer?
For something to be an oxidiser. It must be capable of being reduced. The presence of oxygen is no particular indicator of the oxidising ability of a given species. 

In potassium permanganate, manganese is in its +7 oxidation state (a very high oxidation state), consequently it is a good oxidant agent as it is able to gain electrons, causing oxidation of another species and itself being reduced. 

In ethanol, there isn't the same possibility for reduction as the molecule is already in its lowest oxidation state. Even ethanal  (an oxidation level up) isn't particularly oxidising (despite being able to accept electrons and become formally reduced).