I've found gods and kais rarely are worth the trouble that they bring. Useful at times, but so many of them are just giant children who refuse to pull their weight. [He may be saying something different if Beerus was here... actually no, Vegeta would still say that right now. The God of Destruction spent most of his time eating and sleeping. Maybe for the better though, less planets being destroyed that way.] Or those who would believe themselves to be equal to a god. [Yes, you again, Freeza. Don't deny it.]

Yes, maybe it was better your people are gone, but you won't know if that is true or not. Short of discovering a timeline or universe in which it didn't happen. [Maybe it's easier for Vegeta to just accept what is done. Or maybe it's due to his Saiyan upbringing, where they were raised not to gain too much attachments to others. It's not like he could bring back his people, and even if the Dragon Balls would allow that in some way, he wouldn't. What was there for him to gain by doing that? His pride in his people will never waiver, what they stood for and believed in, but also recognizing that all of that would come to an end eventually.]

I always believed that only myself and one other full blooded Saiyan survived, [Leaving out the bits about Goku having killed Raditz, and Vegeta killing Nappa, for now.] However others seem to keep popping up. Maybe there are others out there of your kind that you just haven't found. The universe is a big space, let alone other universes.