Any theory that uses the Hyksos (Sea Peoples) as an explanation is usually wrong. Crackpots use them because so little is known about who they were, and where they came from, hence any wild claims are harder to disprove.

http://en.wikipedia.org/wiki/Origins_of_the_Hyksos

For a good up-to-date erudite but readable account, see '1177 B.C.: The Year Civilization Collapsed' by Eric Cline.

[prologue] http://press.princeton.edu/chapters/p10185.pdf