@cyberlyra I think about the most important word in your definition of keener is the word "selflessly". It shows up in American news stories about disaster relief or about rescues from life-threatening situations. But it shows up because it's news. It isn't, I think, the norm.
It's like "humility" in that way. Lauded in some circles (especially some faith-centered circles), but not the national norm.
These are not widespread American traits. We would be a better people if they were. Better to be keeners in the Canadian sense than to constantly feel the need to revert to keening in the wailing and lamentation sense.