question:  Why do the Vegans want the humans to be involved in their political struggle?
context: These humanoids had large mouths and sharp teeth, and they unquestionably slavered. If they carried out the threats of their present attitude, Earth would have to send Marshall to replace him. Behind him stood a heavy and pompous appearing Vegan in lordly trappings. What I meant was that I expected someone from Earth to break through our blockade and come here. "If you wanted someone from Earth to come here to see you, why did you put the cordon around Earth? And why did you drop a planet-buster in the Pacific Ocean, and tell us that it was triggered to go off if we tried to use the distorter drive? But you did come, so I can tell you that although I am the leader of one of the mightiest peoples in the Galaxy, whereas there are scarcely six billions of you squatting on one minor planet, we still need each other. There are more inhabited planets in the Galaxy than there are people on your single world. "You upstart Earthlings are a strange and a frightening race," he said. There was even serious discussion of destroying Earth out of hand, while it is still possible. There were at that time three different but similar racial strains of pulpy bipeds, numbering a total of perhaps a hundred thousand individuals. While these creatures could by no means be classed among the intelligent races, there was a general expectation, which we reported to the Sunda, that they would some day come to be numbered among the Servants of the Emperor. The men of Earth had decided that it should work in theory. They had headed for that planet confidently and unsuspectingly, using the ion drive. Two weeks later, while they were still several planetary diameters from their destination, they had been shocked to find more than two score alien ships of space closing in on them—ships that were swifter and more maneuverable than their own. Although far within the dangerous influence of a planetary mass, they had again activated the distorter drive, and they had beaten the odds.
output:  They think the humans can add an unexpected element to their war
options:  They think their numbers will even the fight  They see the humans as having a complementary skillset  They are desparate and will try anything to change their situation  They think the humans can add an unexpected element to their war