If there were no black holes (wild speculation here), everything would just fly off into infinity and there wouldn't be a chance for anything to coalesce into matter, into the stars and planets, into galaxies and the universe, into life and its many forms.
Gravity is what we call the force that pulls black holes together but we hardly know anything about it, other than what we can perceive are its effects and behavior. It pulls matter together, black holes being an extreme case of what gravity is capable of. But so do stars and planets. Is there a little bit of what makes black holes at the center of stars and planets as well? The commonality we can see between black holes, stars, planets, etc., is the effect each of these bodies has on other material objects, the gravity that pulls things towards themselves, towards the central point around which each body forms.
With gravity pulling us all into the Earth, it makes perfect sense why we call our own body's ultimate destination the grave.