The with National Parks is just a representative example of what will happen in various ways with institutions and programs either within the federal government or reliant upon its funding.
”Cutting is necessary and must be steep,” and “not everyone will like all of the cuts” is not the same thing as saying that the tech startup ethos of “move fast and break things” is the way to go. That comes from people who don’t have a lot to lose from the breaking process.
As is the case in partisan politics, the opposition party is the one most vocal about the administration’s actions. So Republicans realize that the President is trying to target Dem pet projects and things they dislike or don’t care about. The feelings about that get amped up in the schadenfreude and “cry more” cries of Lib-owning glee.
That all makes it easier for so many people to forget that something they actually want will wind up on the chopping block (so Republican members of congress have to go beg and kiss the ring yet again) or that the downstream effects could be anywhere from fairly bad (Musk’s little “some pain” acknowledgment) to disastrous for many Americans, and that pain won’t be meted out solely based on who the sufferers voted for.