This article presents a quantitative study of differential participation in low- and high-risk activism in the Danish refugee solidarity movement. Distinguishing between low- and high-risk activism, it shows the fruitfulness of combining what are often considered competing theoretical explanations related to (1) values, (2) microstructures, and (3) emotions. We analyze data from a unique survey of 1,856 respondents recruited via Facebook. The results show that low- and high-risk participation strongly correlate but are influenced by different factors. For low-risk activities, the most important factors are emotional reactions, structural availability, and predispositions in the form of basic human values. For high-risk activity, the important factors are prior history of activism and emotional reaction. Values, microstructures, and emotions interact in relation to participation in both kinds of activism, which points to promising avenues for integrating and developing the theoretical framework of differential participation and recruitment.