All hate crimes are false flags until proven otherwise. This is always an excellent rule to follow in 2016 America.
This is
2017 America. Barack Obama, as clean of religious bigotry as any President, would have the FBI snooping around southeastern Pennsylvania and southwestern New Jersey. Members of known hate groups would already be called in for secretive questioning. But he is no longer President.
We have had the most fundamental change in American political and cultural life in America since the 1930s, and it is not a "new Birth of Freedom". Many people feel much more free to express primitive hatred.
1. This looks like antisemitism. Too many stones are damaged to suggest a personal dispute or a youthful prank.
2. There are plenty of suspects -- Kluxists, neo-Nazis, and Jihadi terrorists. This is for local, state, and federal law enforcement to investigate, and the courts to prosecute.
3. Jewish-Islamic relations are very good in America. Islamophobia and Jew-hating have much the same psychological dynamic. Jewish groups have consistently opposed bigotry against Muslims in America.
4. I am not blaming the President.