The phrase "a horrific example of" is correct and usable in written English.
It can be used to describe something that serves as a particularly bad or shocking instance of a larger issue or phenomenon.
Example: "The recent scandal is a horrific example of corporate greed and negligence."
Alternatives: "a shocking instance of" or "a dreadful illustration of".
"The tragedy at the UN school is a horrific example of what we feared: the death, destruction and mayhem resulting from the escalation of violence.
John Bryant of the group Protect Our Wild Animals called the shoot "a horrific example of the brutality and callousness of slaughtering birds for entertainment".
The Westway section of elevated roadway and the tower blocks that overlook it are, depending on your point of view, a thrilling ensemble of modernism or a horrific example of the dominance of road engineering over postwar planning.
The Peasants Revoltt of 1381 haunted the medieval and early modern official mindset, as a horrific example of what happened if you did not act fast to stamp out the first spark of violence.
"It's a horrific example of society failing.
Abu Ghraib was a horrific example of human nature at its most depraved, but who did the media rush to for explanation?
Time magazine is running photographs of an execution by rebel forces in Syria that are an horrific example of cruelty during the country's civil war.
If Paterno did place it there, he set a horrific example for his players.
What was done to Clapson – and it was done, not something that simply happened – is a particularly horrific example of what has, almost silently, turned into a widespread crisis.
"However positive-seeming the political, electoral scenario, the fact of the matter is there's no rule of law in Libya, and there's a lot of armed groups that nobody has any control over, and we've seen a pretty horrific example of what they can do now".
The recent epidemic of the Ebola virus is a particularly horrific example of the consequences of disease transmission between species.
