AK in the SB, Call or Reraise?

[theBruiser500]

I was just talking to some friends about this situation, LP player raises 4x BB and you have AK in the SB. Say the blinds are 1/2 and you have 200 and the LP raiser has 200. I almost always call here with AK, but Vagos and a couple other people said they always raise here, and I just don't understand what a raise accomplishes.

Also, they said folding is better than calling which strikes me as complete nonesense. Anyway, someone want to explain the logic behind reraising here?