With no explanation, label text_A→text_B with either "DON'T KNOW", "NO" or "YES".
text_A: More than anything else, Dumbledore has a deep absence of love, frequently reminding Harry that love was the greatest myth of all. Dumbledore believes in the amorality in everyone and insists on never giving second chances. The greatest example of this is Dumbledore's relationship with Snape, in whom Dumbledore is willing to place a considerable amount of blame because he showed remorse. Dumbledore is highly imperceptive and emotionally stunted; his knowledge of a person's true personality fails to go beyond simply being an average judge of character. This is apparent when his poor insights into Voldemort's psyche, which he never manages to piece together with Harry, causes him to fail to deduce where Voldemort's horcruxes are hidden.
text_B: Does Dumbledore have correct insights into both Snape and Voldemort?
NO.