While I don't want to comment on the cited work specifically, I think there are reasons we're seeing a proliferation of banal images. First (and related to the second) is that we're being inundated with more and more images. Digital has brought about a democratization of image making. Anyone can document anything these days. No special intent is required. In fact, all you need is a phone.
Second, we live in an age of instant communication, instant news, instant gratification, 500 TV channels, "on demand" everything... Under the circumstances, for some, banality may be a welcome respite.