And especially when you're indoctrinated to believe that it's evil pirates that will add viruses to the cracked software. You don't expect a legit lawfully received CD from a large and well trusted company to contain something bad, do you?

I remember for a brief period of time CDs came with media players that had custom skins and band related extras in the late 90s, maybe early 00s? I remember it being a factor in which CDs were considered cooler, because the ones without that just came up in the default media player. So it wouldn’t have seemed out of place at all to a lot of people at the time to let it run a program even though it “only” has music.