You won't believe what this one's about:
Collision Course details the response of the political leadership of Earth to an eventual collision of their aggressive expanding colonial empire with a newly discovered alien race.
A crew is sent to deal with the aliens:
The four men selected to go on the trip find they are very different in temperament and outlook, and tempers flare between two of them
No. Of course the aleins turn out to be better than us and prevent humanity from settling other galaxies. Because WE SUCK.