If only the NSA had been spending the past decade hardening our cyber infrastructure rather than spying on its citizens and keeping found exploits secret from our industries
Your statement makes sense if you assume the best while considering the purpose of the NSA. Maybe they're doing exactly what they're supposed to do, and we are just making the wrong assumptions about their goals..
>NSA postures to prevent and eradicate threats and help the United States and its Allies defeat adversaries consistent with its authorities and with guidance from various national strategies.
From their about page [1], assuming you can take it at face value.