Eh, they've always been doing that. Look at the 70s and 80s. And 50s and 60s. And... you get the idea. Even bands I really like, such as Incubus and RHCP do it.
Still, people can sing about whatever they want to. Just like I can cover my ears and go "Na naaa na na na na na naaa na na na na na naaaaaa!" 'cause I don't care.
