First off, let me state that i am a huge supporter of the Locust, i don't think they are the evil ones, even though they have commited atrocities during the Locust war.
Queen Myrrah initially said something along the lines of "We could have cooperated with the groundwalkers but they know only dominance".
Bare in mind, that humans treat monkey's who are genetically 97% identical to humans, horribly, commiting all sorts of experiments on them.
So were the Locust right to start a war? Or would the CoG have been friendly and help with the lambent problem or would they have shunned the Locust and started a war anyway?