  We analyze cross sections for Quasi-Elastic inclusive scattering of electrons
on nuclei and show that the observed isolated peaks for relatively low $Q^2$
are unique for the lightest targets. Focusing in particular on D and $^4$He, we
investigate in two ways to what measure the above peaks can be allocated to
nucleon-elastic processes. We first compute approximate upper limits for the
nucleon-inelastic background in the Quasi-Elastic region due to inclusive
$\Delta$ excitation, and find those to be small. Far more precise is a
semi-phenomenological approach, where the dominance of nucleon-elastic
processes is translated into a set of stringent requirements. We show that
those are very well fulfilled for recent D data, and to a somewhat lesser
extent for older D and $^4$He data. With knowledge of $G_{E,M}^p$ and
information on $G_E^n$, we then extract $G_M^n$ and find agreement with values
obtained by alternative methods. We discuss the sensitivity of the extraction
method and mention future applications.
