Because genetically speaking, we have evolved to cooperate as a community.
No, genetically speaking, we have evolved to cooperate as a tribe. Now we can crash the skulls of other, smaller tribes and take their bananas.
Better yet, our alpha males have learned how to frighten lesser tribe members into believing that other tribes are out to take our wives and kill our babies, in order to convince them to go crash some skulls and bring the bananas home.
Browser requirement checklist:
* Comes with the distribution repositories and is stable, maintainable and patched
How is it then, that everybody and their aunt complains about the fact that the Windows distributions have included a browser for ages? Aah, you mean because of the stable, maintainable and patched part of the requirement...
The decision doesn't have to be logical; it was unanimous.