With roller bearings, the contact area between the inner and outer races is not a point, but a line.
Radial ball bearings may be the most common antifriction bearing, but they're not the only way to support a rotating shaft. Indeed, because the rolling elements are spheres, they only contact the inner and outer races at one small point. This limits friction and ensures smooth motion, but it also means there's not much contact area supporting the load. If the bearing is overloaded, the balls can be damaged.