It is impossible to disconnect the two.
From where Ghandi stood morally, he had something to say about moral imperatives. Zarqawi doesn't.
Methods and motives are ALWAYS connected. A cop who shoots a hostage taker is doing something different than a bank robber who shoots a clerk, although the action is the same, and both result in a death.
As an aside, I suspect that if the Palestinians had, years ago, adopted Ghandi's techniques instead of bombing cafeterias, they would have gotten a state a long time ago, and the sympathy of the vast majority of the people of the world.