Media shouldn't spread inflammatory, deceptive rhetoric.
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history
From 《元史·刑法志》: '诸阴阳家者流,辄为人燃灯祭星,蛊惑人心者,禁之。' Yuan-era statutes outlawed mystics who 'lit lamps and worshipped stars to bewitch the public' — the original 蛊惑人心 was sorcery, but the meaning generalized into political deception.
memory
蛊 (gǔ) was an ancient sorcery practice — sealing venomous insects in a jar until one survived to become a curse. So 蛊惑 is literally 'to curse-bewitch', and 蛊惑人心 is 'to cast a spell on people's hearts' through lies.