units without an actual ground pin on the unit AC outlet...

Whatever did you do before polarized piugs?
I mark 'em with a black sharpie.

Gee, in my years in working on electronics on B-52 and KC-135 and 20 + years in electronics after the military, I did learn a bit.  And yes, manufactures of many things, and politicians like to think you are dim.  

It kind of explains obese Americans that are still undernourished. 

Polarity and ground pins are not the same thing.  But the replies so far tell me what I need to understand. 

1-15P only require 2 blades, the electronic device is suppose to be double insulated if it uses this type of connector.

Not only audio but coffee pots, electric drills, hair dryers there are a lot of appliances that are rated II or □

So now the ground pin and polarity are responsible for undernourished obesity. This thread has forged new lows in electrical misinformation, and in remarkably few posts. Good work, team!