A) You're thinking of Space Force, not SPACECOM.

B) Space Force isn't anything new. It is doing the same projects it was doing under the Air Force, with the same budget it had under the Air Force, with mostly the same officers/leadership it had under the Air Force.

C) You can debate about whether a trillion dollar defense industry is ridiculous. That's valid. But if you assume we need a defense industry that large, then the work the Space Force does (again, which hasn't changed since it was the Air Force) is absolutely necessary in the modern era.