  We evaluate the possibility of the formation of naked singularities in the
interaction of Kerr black holes with test massless spin-2 fields. We analyse
the scattering problem for both extremal and nearly extremal black holes by
incorporating the explicit form of the absorption probabilities. We show that
extremal black holes become non-extremal after the interaction with the modes
with both positive and negative absorption probabilities. For nearly extremal
black holes the absorption probability for the challenging modes turns out to
be of the order $\epsilon^5$, where $\epsilon$ parametrizes the closeness to
extremality. This value implies that the event horizon is preserved without the
need to employ the backreaction effects. The result directly follows from the
incorporation of the absorption probabilities into the analysis. We also review
and extend our previous comments on Sorce-Wald method. We show that the order
magnitude problems can be avoided by abandoning the non-physical parameter
$\lambda$. The conditions derived by Sorce-Wald can be legitimately used to
incorporate the back-reaction effects by avoiding to multiply them by
$\lambda^2$, thereby preserving the magnitude of their contribution. We apply
this method to the problems of over-charging R-N black holes and over-spinning
Kerr black holes, in a rough analysis ignoring absorption probabilities which
could apply to test bodies.
