Synirr
"No one is a failure unless you try"
Exactly. Of course bettas are territorial, and this is vital to their survival in the wild, but wilds are not territorial or aggressive to the same extent domestic splendens are. A pair of wilds living together in the same tank are not likely to constantly attack one-another (in the splendens complex, at least.) It's possible, but not likely. A pair of domestic splendens in the same tank are likely to rip one-another to shreds, if not kill one-another. It's possible they won't, but more than likely they will. That's the difference, and it's entirely man-made.But I'm not convinced that the level of aggression that domestic Betta splenden exhibit is natural or only related to survival of the species. I suspect that their aggression is enhanced from the wild natural state (just like the massive tails that would not be conducive to survival in the wild) by selective breeding over hundreds and hundreds of years. They can not really be compaired to wild Betta splenden.
Personally, I love the fact that bettas are volatile. I actually like having to keep them all individually; it adds a challenge and flavour to their keeping. However, I don't think it would be an awful idea to breed some of that aggression out that has been bred in. Not something I'd do, personally, but not a terrible idea. What would be a terrible idea would be trying to make them something they are not -- a peaceful species. Dogs are not solitary, cats are not pack animals, and bettas are not a social species. Trying to change them into one would alter them beyond recognition, I imagine, and what's the point in changing a species into something it's not when other species are readily available to fill that niche?