  A simple argument based on an SU(3) gauged horizontal symmetry is presented
that connects the explanation for three generations of matter with the
existence of a triplet of right-handed neutrinos. This rationale for
right-handed neutrinos is analogous to, but completely independent of, grand
unification or extra universal dimensions. A brief discussion of the
supersymmetrized SU(3) model is also given, pointing out that certain problems
in ordinary supersymmetric models such as fast proton decay via dimension-5
Planck-suppressed operators can be naturally solved.
