Are you sure they are learning to use it?
From what I have seen, they buy a $35 Chicom, throw it in their "go" bag and they are done. Never hear them on the air or utilizing their radios on the amateur bands. IMHO, passing the Tech exam does not teach anyone how to "use" a radio.
At least some of them are, and maybe in their way of thinking not drawing attention to their real purpose for operating on the amateur bands is the goal. As ko6jw_2 mentioned in regards to family or church groups, some survivalist/prepper/patriot groups cannot match up their particular interest in radio with any of the basis and purpose items listed under 97.1. Having an effective means of emergency communications for their group as opposed to providing emergency communications to the public, or just wanting to "use" radio but no desire to contribute to the advancement of the radio art, as examples.
To their credit, particularly considering the entry level cost of the cheap chicom sets and the number of them out there, not many seem to be causing trouble or much interference. I know "not many" doesn't equal "none", but still.