  We report the results of a spectropolarimetric survey of a complete far
infrared selected sample of Seyfert 2 galaxies. We have found polarized broad
Halpha emission in one new source, NGC5995. In the sample as a whole, there is
a clear tendency for galaxies in which we have detected broad Halpha in
polarized light to have warm mid--far infrared colours (F(60um)/F(25um)<4), in
agreement with our previous results. However, a comparison of the optical,
radio and hard x-ray properties of these systems leads us to conclude that this
is a secondary consequence of the true mechanism governing our ability to see
scattered light from the broad line region. We find a strong trend for galaxies
showing such emission to lie above a critical value of the relative luminosity
of the active core to the host galaxy (as measured from the [OIII] 5007A
equivalent width) which varies as a function of the obscuring column density as
measured from hard x-ray observations. The warmth of the infrared colours is
then largely due to a combination of the luminosity of the active core, the
obscuring column and the relative importance of the host galaxy in powering the
far infrared emission, and not solely orientation as we inferred in our
previous paper. Our data may also provide an explanation as to why the most
highly polarized galaxies, which appear to have tori that are largely edge-on,
are also the most luminous and have the most easily detectable scattered broad
Halpha.
