Who gets to judge those things, though? Currently it is a crew of inexperienced 19-23 year old coders who might be able to write script but clearly have not a clue about anything else. Cuts are being made on the basis of what Elon Musk thinks is useful to himself. He is of course well known for his lack of ability to care about anyone except himself and his 10,000 offspring (or so I infer from his statements and behavior), so condemning a few million people to die of malaria, HIV, or starvation is a small price to pay if he gets his tax cuts and trip to be the king of Mars.
When Congress creates programs and allocates money, the Executive Branch has no constitutional authority to kill or defund those programs. The Executive can lobby Congress to get rid of such programs, but to do so they would have to convince Congress to take responsibility. Unfortunately the current cult formerly known as the Republican Party is all too happy to let Musk, who doesn't have to worry about re-election, take the heat for killing programs and ruining many lives, at least until he goes after Social Security, Medicare, and Medicaid (which will begin any day now) and 2/3 of the people who vote R suddenly find themselves in line at the soup kitchen. I fear, though, that virtually every Republican congresscritter will discover that they have no idea where to look for their cojones after Trump and Musk cut them off and fed them to a drove of pigs.