Ultraviolet light treatments introduced into the tracheas of five critically ill COVID-19 patients appeared to be safe and associated with a reduction in the respiratory load of SARS-CoV-2—the virus responsible for COVID-19—in all but one patient, according to a study conducted by Cedars-Sinai. [0]
Maybe people should be trying wild stuff on themselves. Granted they shouldn't make sweeping recommendations from it. But moving fast and breaking things solves more problems than waiting for scientific consensus. Planck's Principle and all that.
[0] https://www.cedars-sinai.org/newsroom/reduced-viral-loads-se...