Reality! Because the Chinese recycled chevy tool you're trying to use is incapable of exerting enough force to do so! Not to mention that the tool you're attempting to make use of will not allow you to position it to apply any force that could move the ball joint from the spindle. The ball joint needs to be forced from below, upwards and outwards from the cup of the spindle where it resides. There is no way to position the head of the tool so that it makes contact with the spindle as you would apply forcing power to the bottom of the ball joint.