True, but this is where Presidents and VPs get some special treatment, because so much of their work involves classified materials, they are “working” 24/7, and have no practical way to separate their personal and workplace spaces. So it is logistically much easier for them to simply retain something they shouldn’t have by putting it in the wrong pile. Manning, on the other hand, had a clear space where they needed to interact with that info, separate from their personal space. There are far more controls in place for someone at Manning’s level than for the VP or President.
That doesn’t mean breaches shouldn’t be taken seriously at the highest levels, but they do get the benefit of the doubt.