George Steinbrenner wrote:
At least Kruge knew exactly what the Genesis planet was. Placing Khan and his crew on some random world wouldn't do anything, because there'd be no reason for passersby to suspect that anything was there.
By having spies deep within the Federation that could access those records. What makes you think those same spies wouldn't exist in the Abramsverse?
Wherever Khan and his cadre are stored, danger exists someone could set them free either intentionally or inadvertently. In the Abramsverse, the Klingons now have had a pair of run-ins a century apart with what seems to be human(s) of exceptional ability.
It may pique their curiosity.