D I’m not sure though so if it’s something important I wouldn’t put that
Many citizens are upset by our lack of participation.

The harmonic frequency refers to the resonant frequency that is an integral multiple of the fundamental frequency, harmonics are usually simple sinusoidal oscillation at a single frequency. where as Resonance frequency are frequencies that are not necessarily sinosudal or integral multiple of fundamental frequency and it may have complex oscillations made up of multiple harmonics ~
It's like if you play a piano with a single key, it will show harmonic frequency, but if you use multiple keys at a time it may show Resonance.
Macbeth in these lines is potrayed as a villian, which, of course, is what she is. So the words would, of course, be villanous.