The Demon Cleansing Bureau's attitude towards the Blood Demon Sect is even more severe than that towards the Smell Fragrance Sect.
Although the Smell Fragrance Sect is a cult, they only beguile common people to become followers, and though they too might die from the fragrance, it happens somewhat slower.
In contrast, the Blood Demon Sect is more direct, often inciting boundless massacres, extremely cruel.
At its inception, the Blood Demon Sect was actually a normal Martial World Sect, considered a very legitimate Great Sect of the Demon Path.
The Demon Cleansing Bureau doesn't oppose the Demon Path; in fact, many of the Xuanjia Guards within the Bureau practice Demonic Techniques.