fails if you know the history...though i do realize that one absolutely MUST ignore the short history of the period in order to somehow blame israel...but then you probably arent...i believe your just raising the question...correct?
the short history for those how dont know:
israel withdrawls from gaza: during the withdrawl no attacks from gaza, no attacks from israel.
withdrawl complete: attacks from gaza 30 missiles same night....and continual attacks almost daily
israel responds with sonic booms, shells in open areas.....nothing changes the kassams keep coming
and there were other periods when israel didnt respond...and the attacks kept coming....
dec 2006
http://www.phrmg.org/aqsa/dec2006.htm and then of course we have the hamasnkim shooting up the food deliverys and import posts.....i'm sure thats also "tit for tat" (though i'm not quite certain what the food importers did or how they retailiated....)
so much for the tit for tat...but then admitting that sure ruins the "israel has to be blamed' syndrome doesnt it?