Dude they never stop playing Holy Diver. I hear it on the radio at least once a week, and only a few hours of my week are spent using a radio. Why can't they play some stuff from the Sacred Heart album? Dream Evil album? They play Rainbow in the Dark too much, but at least that is a tolerable song.
My Dad got me the Dream Evil record the day I turned 12. Before that was the Sacred Heart album. Before that was Mob Rules. Kids aren't exposed to Dio songs in the right order. Holy Diver should never be first. Last in Line should never be first. Do you shovel steaming chunks of ravioli into your toddler's mouth? No, you blow on it first. You cut it into pieces and act like you care what you put into your toddler's body. Radio people should be the same way with Dio Songs, and they should treat public ears like the delicate mouth of a toddler. People don't know how to interpret Holy Diver if they haven't heard his basic stuff. Just Another Day is an intermediate song. Start them with that, then move on to Wild One. Once they understand Wild One, they may be able to appreciate Holy Diver.
Reading decreases intelligence, so keep it to a minimum, but you should read the RJD autobiography. Also, there are some good lyric perspectives in Black Sabbath and Philosophy: Mastering Reality.