This is not just killing a Jew. This is taking delight in murder. This is a ritual. Not just stabbing him to death, but burning his body afterwards - they didn't want to merely murder but to quench a bloodlust of hate for Jews.
Notice also that the victim was not a "European invader." He came from Yemen, spoke Arabic - supposedly one of the Jews whom Arabs were not prejudiced against. But on the contrary, Menahem Manmuni was deliberately subject to mutilation because he was supposed to be a meek, weak dhimmi and didn't play the role assigned to him by Muslim supremacists.
The next day, other Jewish civilians were murdered as well.
Here is an interesting Arab analysis of the future of a Jewish state in the region, and the Arab prediction that eventually, terror attacks will wear down the Jews.
