While I hope not to open the entire can of worms to which codyrobbins referred, ...

wanorris on Nov 4, 2011 | parent | context | favorite | on: Google threatens to cut ties with Chamber of Comme...

While I hope not to open the entire can of worms to which codyrobbins referred, I strongly suspect "I could care less" is a shorter form of the more obviously ironic "like I could care less". Treated as straight-up irony, the usage makes perfect sense.