The simplest answer is that it is more convenient, more timely, and more accurate to use ballistic missiles. Satellites would be spread all over the globe, as a consequence of orbital mechanics. (I worked on space weapon system constellation design.) The tungsten rods would simply penetrate the rock to a depth of kilometers, not vaporize into a nuclear-class explosion. Again, easier to use a nuclear warhead. Or just a ballasted re-entry vehicle, if you can home to a tight accuracy on target.

Here comes a bad guy. Do I need to drop a locomotive on him? No, a large pistol will do nicely. Or a hand grenade.

There are ways of getting the job done without hauling tons of tungsten into orbit.