At the beginning of LOCH, a storyteller said this about the Huizong emperor:
"Thinking back to those years when the Huizong emperor only thought about immortality, wanting to be a god, using corrupt officials, like Cai Jing, Wang Fu, who were shameless people that only helped the emperor to acquire things; like Tong Guan, Liang Shicheng, who were eunuchs that only knew how to boot-lick; like Gao Qiu, Li Bangyan, who were playboys who accompanied the emperor to brothels. The emperor didn't care about official business, if not spending all day searching for gods to learn the Dao, then sending people everywhere to search for weird plants or rocks. When the Jin army appeared before his eyes, he had no idea what to do, retracting his head, he transferred the responsibility of emperor to his son, Qinzong. At that time, the virtuous official Li Gang was defending the capital Bianliang and the generals commanded their soldiers diligently, the Jin army couldn't enter, and could only retreat. But who knew that Qinzong would listen to the advice of corrupt officials, and dismissed Li Gang, and didn't make use of renowned, able generals, but placed his trust in a trickster Guo Jing (no, not
the Guo Jing

), who claimed to be able to summon heavenly gods and generals, and control the wind and rain, and ordered him to summon heavenly generals to defend the city. Since the heavenly generals weren't willing to come, how could the capital not fall? At last, Huizong and Qinzong were spirited away by the Jin army. These two incompetent emperors brought this on themselves, and hardly matter, but they've also harmed our thousands and millions (10,000s) of Chinese civilians."
Although the speaker is just a storyteller (and hence unreliable/prone to exaggeration), it shows that Huizong was regarded as a thoroughly incompetent emperor who ignored matters of state to indulge in his own whimsies. Sending an army into foreign territory and completely disregarding diplomacy to exterminate 'heretics' would not be out of character with this portrayal.