Loomer has promoted various conspiracy theories, mostly related to mass shootings. She has falsely claimed that school shootings in February 2018 in Parkland, Florida, and in May 2018 in Santa Fe, Texas, were staged, and that the perpetrator of the 2017 Las Vegas shootings was affiliated with ISIS. Loomer claimed on Twitter that crisis actors were used for the Santa Fe school shooting, prompting concerns about the amplification of misleading information and conspiracy theories by troll farms and social bots.