Noise.
The noise kept the F-104 in the air.
When the noise stopped, it plummeted.
If that occurred as the plane was passing through 20,000 feet over the end of the runway, it could make the runway in the plummet.
Otherwise, eject, eject, eject.
Belly landing the thing with the ventral fin would be fatal.
The Luftwaffe was flying it outside the envelope the other nations were, which contributed to the appalling loss rate they experienced.
Like the MiG-21, it was an airfield perimeter defense airplane, nothing more.
One of my friends flying F-8s for the Marines said they'd fly over an F-104 base taunting the flyboys... knowing the -104s couldn't get to and land safely after.