I support this graffiti if it is only meant as an empty threat..to scare Muslim perpetrators away or to make them rethink their desire to hurt a single Jew.
I do not support creating gas chambers to gas just any Arab. But I do support creating gas chambers for Muslims who call out to gas Jews or support Hitler...and I mean literally, if we can find each and every single Muslim who says these things, then I'm either for gassing those very Muslim Nazis Anti-semites, or simply hanging them like we did to Haman and his supporters....
And anyway to kill or to bash the heads of Nazis like those is fine with me...one fell swoop.
I think in Jewish neighborhoods with no Arabs or Muslims around, this message wouldn't be effective. I think a message in a Jewish neighborhood ought to be something like "Kahane Chai" or "Kahane was right" etc etc etc...