“People with insidious motives have taken advantage of the widespread deployment of masked immigration officers as cover to allegedly harass civilians or commit violent crimes such as kidnapping, robbery, and sexual assault …” https://www.americanprogress.org/article/masked-and-unidentifiable-the-risks-of-federal-law-enforcement-operating-without-identification/
Masked and Unidentifiable: The Risks of Federal Law Enforcement Operating Without Identification

Since taking office, the Trump administration has undermined public safety and law enforcement accountability by supporting the dangerous practice of obscuring the identity of ICE and other federal officers.

Center for American Progress