This article highlights the convenient excuse of (il)legality used by (1) religious majoritarian mobs to justify attacks against places of worship and religious buildings of minorities; and (2) police and local authorities to absolve themselves of the failure to uphold public order and the rule of law, protect religious minorities, and to punish religious minorities. This article traces the emergence of legal violence in the form of anti-mosque vigilante extremism in Myanmar from 2012 onwards and analyzes cases of attacks against: (1) “illegal” mosques; (2) madrasas being used as or reconstructed into mosques; (3) buildings allegedly being constructed as mosques; (4) private homes and public spaces being used as mosques; and cases of (5) closed mosques not being allowed to reopen. The author primarily used Myanmar-language resources as well as interviews to conduct the research.