Musk certainly shares responsibility, but focusing responsibility on him lets others escape blame - eg Trump, Congress, the corpo and individual edgelord enablers sanguine about chaos, etc.

And frankly, it's sad enough for Musk already - richest guy in the world, he could have actually done something politically on his own, and yet he still ends up being used as a useful idiot scapegoat by a con artist. "But Trump promised he cared about the debt!!1!1!"