I wonder who the other passengers were. Probably the kind of people who would possibly keep Wagner resistance up or have too mich influence and are considered a liability in a takeover.
Or maybe Prigozhins family to strike fear into Wagner troops about their family if they don't cooperate.
Or, since there were reports that Wagner troops are scrambling Prigozhin didn't join the flight as a ruse.
Well the last one might be a reach and entering bullshit conspiracy theories but in general I'd like to know who was on that plane.

Dmitry Utkin was likely on the plane, so that's one more dead Nazi, He was also the founder and co-leader of Wagner.

Ok that makes sense.
Still, there was no need to shoot down the plane. Maybe as a visual revenge for the Russian plane Wagner shot down. Definitely some people died who didn't need to die so this is a barbaric act with no regard for human life.