My thoughts on this are, humans are pattern propagation machines. If someone is infused with spite and misery to begin with, love which fails to acknowledge and process that spite comes off as hollow and meaningless. Seeing others express the same things you feel is cathartic and generates trust. There is a profound need for sharing in feelings like contempt, rage, and the desire to hurt others that isn’t fulfilled, and that gets exploited by people crafting those feelings to fit into their ideological narratives.