Exceeding VNE may induce aerodynamic flutter, this
can and almost certainly will cause catastrophic failure
of the airframe. Put simply try and avoid both but
if the choice is exceed the placarded G loading or
VNE the G loading is the only choice. The potential
for catastophic failure is much much greater if VNE
is exceeded,


Why?

exceeding VNE is therefore not an option.

Isn't there a built in safety margin for both G's and VNE?

A modern sailplane is built to withstand a sudden updraft of 10 m/s at
Vne. If you pull at the same time, it is more than likely that the wing
won't make it.