Join or die.IoM do not have another proposition.
Ironically, neither does the ICOG
and they've got more dakka than the Imperium. The Imperials will be really upset, briefly, until the ICOG finishes conquering or obliterating them. Primary disagreements being:
- The ICOG is even more human-supremacist than the Imperium, astartes and admech won't measure up to their standards.
- The ICOG innovate and have absolutely no compunctions about reverse-engineering and using xenotech.
- The Imperium runs on fantasist hero-worship, the ICOG hates that*.
- And most importantly, they don't worship the Emperor.
* The ICOG want's unity above all else, so they HATE heroes of any kind. The main character of exultant managed to score a kill on a Xeelee Nightfighter but disobeyed orders,
so the ICOG literally traveled back in time and court-martialed him two years ago before he even did the act for insubordination.
(while still reaping the benefits of the heroic act because Xeeleeverse time-travel is accasual)
"Do not remember heroes. Do not speak their names. Remember my words, but do not speak my name. I have a vision of a Galaxy overrun by mankind from Core to rim. Of four hundred billion stars each enslaved to the rhythms of Earth's day, Earth's year. I have a vision of a trillion planets pulsing to the beat of a human heart. And I have a vision of a child. Who will grow up knowing neither family nor comfort. Who will not be distracted by the illusion of a long life. Who will know nothing but honor and duty. Who will die joyously for the sake of mankind. That is a hero. And I will never know her name.
Always remember: a brief life burns brightly."
-Hama Druz, circa 5408
The Imperium at least values heroes/martyrs above all else.