To the Jewish people who vote democrat this is what happens.
The victim, from what I gather, was a Hasidic (ultra-religious) Jew. This group has voted predominantly Republican is presidential elections over the last several decades. Of course, I couldn't tell you how the particular individual who was injured votes, and it's not relevant to the incident. His attacker wasn't interested.
What is relevant, though, is that black Americans are statistically more likely to be anti-Semitic than any other racial/ethnic/nationality group in the country, other than Arabs. The dead perp is an extreme example of this reality.