not to educate. We wouldn't tolerate intentionally offensive prose, and we should not tolerate intentionally offensive images.
Only in the last 20th century there has happened hundreds of massacres that a textual description of would make anyone sick to their stomach. Should we not tolerate someone writing or reciting this?
Loose the word "intentionally" because noone can accurately guess someon else intent. Loose the word "offensive" because not everyone takes offense. What you are left with is a picture of shit in an article about shit.
You have heard it lots that Wikipedia is not a "vehicle of free speech". But Wikipedia is not a vehicle for the morale conservatists to present their opinion as the truth.