Two studies tested the idea that perceived normalization of radical political ideologies (right and left) reduces support for freedom of speech of the opponents and political tolerance. In Study 1 (N = 633), Americans were primed with the normalization of the radical right or left. Primed with the normalization of radical outgroup ideologies, both liberals and conservatives were more willing to restrict their opponents’ freedom of speech and were more politically intolerant – effects that were mediated by collective angst. Study 2 (N = 632) replicated the results of Study 1 and extended them by showing that both conservatives and liberals worried about the image of their party not when they were exposed to the normalization of radical ingroup ideologies, but when they were exposed to the normalization of radical outgroup ideologies. These results suggest that perceived normalization of radical ideologies affects people’s attitudes towards freedom of speech and political (in)tolerance.

中文翻译：

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激进意识形态的感知正常化及其对政治宽容和支持言论自由的影响

两项研究检验了激进政治意识形态（右翼和左翼）的感知正常化会减少对反对者言论自由和政治宽容的支持。在研究 1 (N = 633) 中，美国人开始接受激进的右翼或左翼标准化。在激进的外群体意识形态正常化的推动下，自由主义者和保守主义者都更愿意限制对手的言论自由，并且在政治上更加不宽容——这种影响是通过集体焦虑来调节的。研究 2 (N = 632) 复制了研究 1 的结果并扩展了它们，表明保守派和自由派都担心他们政党的形象，而不是当他们接触到激进的内部意识形态正常化时，而是当他们接触到激进的外群体意识形态的正常化。