In my experience most people at government orgs simply follow the recommendations of 'someone' else. Said someone is in the pocket of some vendor, and 'champions' their cause. The relatively few folk that actually understand the details, are usually not the type to be able to wine n dine their management (because no vendor supported expense budget). Or worse, are single handedly tasked with the responsibility, and no reward (outside of securing your 'country', which effort will be diluted in front of your eyes anyway).

Everyone just buys the ABC company's TPM to put it into their heads and out of their minds.