Could someone explain why dependency-management-systems don't enforce immutable releases? Ie, package owners can publish all the new versions they want, but the

Could someone explain why dependency-management-systems don't enforce immutable releases? Ie, package owners can publish all the new versions they want, but they are never able to edit/remove/liberate an already-released version. It seems like that would solve so many problems, such as the left-pad fiasco.