They're jealous of NPO's strength, yes.
Karma = Quantity (aka ghetto rats) NPO = Quality.
The above answer is a bias from a pro-Pacifican. Below is a moderately unbiased one.
Yes, Karma has it in for the Hegemony. Why? Because of NPO's acts of aggression. Karma alliances have grown tired of unwarranted aggression by Pacifica. NAAC, CIS, GATO, LUE, GOONS, \m/, FAN, BDC, GPA, and now OV. So Karma's alliances stood up to the plate to fight back. And, contrary to the first answer, Karma drew some of the best alliances in Cybernations to their banner. MK, Gre, Umbrella, TOP, and even OBR. A large number of NPO's allies had also ended their relations with NPO before the war, and several (ODN, FOK, RoK, NpO) were on Karma's side.
In short, this is just Planet Bob's way of saying "we're not gonna take it."