Because it looks like the treatments are also part of a trial. We do trials when we don’t really know what to do for the best, so that future patients will benefit when we find out. The current ‘trial’ patients may or may not benefit from the treatment (although they frequently do, google ‘Hawthorne Effect’) but the trial will fail utterly if it’s done in a half-arsed fashion and then we’re still left not knowing what to do. Therefore it’s unethical to continue trial treatment when it isn’t possible to follow the protocol fully. Emergency situations are different.
This is just another example of the shutdown only being applied to useful stuff, while leaving all the shitty government functions that benefit the military-industrial complex intact …