2. General Custer slaughtered "savages" before he met his end
Of course those "savages" were Native Americans who had their own culture but they were seen as inconveniently living on lands people, like Custer, thought were theirs for the taking.
Hamas' rockets are basically glorified fireworks. They are in no way as technically sophisticated as the rockets Israel uses to attack Palestinians. Of course, their lack of sophistication may explain why Israel has a hard time stopping them.
If Israel was serious about eliminating this threat they have 2 choices: 1) exterminate the Palestinians (oh the historic irony that would be) or 2) breakup the settlements and return to the peace table to forge a real, fair and just peace so that both the Israelis and Palestinians can live side by side.