It appears that IWTBL is being released as a single for "rock" radio formats here in the US. I don't know how radio works in Europe but over here we are awash with narrow market, limited playlist type of radio, which almost forces a band to release different songs to different markets. Who Says is doing pretty well at country but HAND has run it's course at rock stations and IWBL is a good choice I think, it may well catch on over here.
FYI, the song is about child abuse and surviving it, so in my book it's not "just another I'm living my life song".