The Team Death Wish that many(?) within the United Vigil have grown to love (or hate) might have always been comprised of fatalistic kids, but there wasn't always just ten of them. Their members met others along the way, or were drawn together by the machinations of some Malice Kings - but while those "others" have moved on to other things, the core group has continued to stick together.
Team Death Wish also has a number of folks who don't officially belong to the blade anymore, but do try their best to help out. Not all of them are willingly along for the ride, but hey: we all gotta do what we all gotta do to save the world, right?