Originally Posted by Milt
Simply stated
If you continue to roll an aircraft which will occur roughly around its centre of mass, that mass out towards the fore and aft extremeties will be describing a circle and may generate high inertial forces tending to enlarge the circles. Without some damping the circles may enlarge dramatically and lead the pilot to believe he has entered a spin.
Low level high speed rapid rolls, particularly in a delta will probably lead to unintentional ground impact on about the third roll.
Nicely put. And amply demonstrated on the Mirage 2000...