  The linear response of a stellar system's gravitational potential to a
perturbing mass comprises two distinct contributions. Most famously, the system
will respond by forming a polarization 'wake' around the perturber. At the same
time, the perturber may also excite one or more 'Landau modes', i.e. coherent
oscillations of the entire stellar system which are either stable or unstable
depending on the system parameters. The amplitude of the first (wake)
contribution is known to diverge as a system approaches marginal stability. In
this paper we consider the linear response of a homogeneous stellar system to a
point mass moving on a straight line orbit. We prove analytically that the
divergence of the wake response is in fact cancelled by a corresponding
divergence in the Landau mode response, rendering the total response finite. We
demonstrate this cancellation explicitly for a box of stars with Maxwellian
velocity distribution. Our results imply that polarization wakes may be much
less efficient drivers of secular evolution than previously thought. More
generally, any prior calculation that accounted for wakes but ignored modes -
such as those based on the Balescu-Lenard equation - may need to be revised.
