Domain knowledge is often considered a minor contributor to environmental attitudes, with social and motivational factors dominating. Yet, domains may differ. Declining insect populations are a critical conservation concern but are not prominent in public discourse, potentially reducing the impact of social and motivational variables. We present data on the relations of insect knowledge (both propositional and causal), associated emotional valences, and political orientation to concern for insect conservation, for samples of American college students and U.S. and U.K. Prolific workers. We asked whether concern for insect conservation is more associated with knowledge than emotional valence or political orientation, and whether this is especially so for U.K. residents, who have a reputation for a love of nature that is not linked to political identity. We found that U.K. participants did show greater overall concern, consistent with the national reputation. Causal knowledge mattered, but political orientation was the strongest predictor of concern for insect conservation for both U.S. and U.K. participants. Valence contributed for U.S. participants but not for U.K. participants. Our results suggest that politicized public discourse penetrates attitudes toward insects even when it does not explicitly concern insects, and knowledge variation has less impact. However, the emotional reaction has a reduced influence where relevant discourse is less polarized. Insects may often evoke negative emotions and motivations, but it is not impossible to love a bug.