While it's true that the narrator of Edgar Allan Poe's "The Black Cat" initially blames alcoholism for his change in behavior and evil acts, as the story progresses, he adds other details that suggest alcoholism is not to blame for every heinous act he commits.
The narrator describes his love for the cat named Pluto, and the closeness of his relationship with the cat. One night, when he arrives at home drunk, the cat avoids him. This angers him enough to cruelly cut the cat's eye out. The narrator has this to say shortly before he hangs the cat:
Who has not, a hundred times, found himself doing wrong, doing some evil thing for no other reason than because he knows he should not? Are not we humans at all times pushed, ever driven5 in some unknown way to break the law just because we understand it to be the law?
There is no evidence that he is drunk at the time this act is plotted or committed. What he says next certainly calls into question his sanity, regardless of alcohol abuse:
I hung it...
(The entire section contains 3 answers and 905 words.)