They might not care about software per se, but they do care about having access to information, education, communication and getting things done faster and better; and networked software enables people to do these things. Provided one has no other computational devices, carrying a dumb phone in this day and age is tantamount to bringing a knife to a gun fight.
I'll assume you are being serious. Many people don't use or want facebook. The only reason it's still on my phone is because I've been too lazy to figure out how to delete the pre-installed applications