What is the best possible non-insane/non-evil explanation for Trump's efforts so far?

I mentioned over in the “Why don’t you just…” thread that what Trump is doing - or particularly, what Musk/DOGE is doing, is a very very simplistic method to finding government waste.

Why don’t they just go through the budget line by line and get rid of waste? They can also set up a way for people to see how much waste they have identified and gotten rid of, in real time!

That is something that the good people of the r/personalfinance Subreddit tell people in debt/without savings that they should do. Why is it not what the federal government should do?*

*Rhetorical question. Please don’t explain why this is not something the federal government should do.