A person has to do a LOT of training not to lock brakes up in a panic situation, on a wet road, or a road with debris on it. In a panic stop, even experienced riders WILL lock up the brakes, particularly the rear...experience will allow one to immediately release and get out of a skid, if it's not too late.
Experience allows us to avoid situations where a panic stop would be necessary, BUT it's that one time that might get you injured or killed. Looking at the larger picture, I think ABS is a very good thing on both bikes and cars, and is a proven safety enhancement for 999 people out of 1000.
Regardless of the braking setup on a bike, practice is still necessary to become familiar with what it takes to bring 900 lbs to a safe stop, and what it feels like to do so. In a panic situation, 999 people out of 1000 are going to benefit from ABS, regardless of riding experience. I would not say that a person who chooses to have ABS "doesn't know how to ride", but that's just me.