Police sketches of their disguised characters being on the nightly news doesn't drive the benefit home already?
Some people just can't grasp certain concepts - don't try to hard to force 'em.
(Imagine, if you will, the unassuming guy sitting in the bar that has the look of a well-experienced runner - yet no one knows his name, and nobody says "yeah, that's the guy that did that job," and nobody is gunning for him... at least, nobody realizes they are gunning for him - a guy about his height, but with a stronger jaw, darker skin, a lot of scars, and I think he might have been a hobgoblin, that guy better be sure not to show his face in the 'plex again unless he wants it scraped off with a rusty metal ashtray.).