Most people don't realize just how big and powerful vulcanism really is and super volcanoes are orders of magnitude more powerful than an "average" volcano. It's understandable that they don't. It's hard to wrap the mind around how much energy is at play there.
As for missiles penetrating the magma chamber, I don't think any "bunker buster" missiles ever created can penetrate 4 to 10 miles of solid rock.
These forces are just insane.
