LA is a big city. LA county has around 10 million residents. Quite ethnically diverse, we’ve got everyone. If I took you around the block visiting my neighbors where I live now it would be like walking the Epcot food exhibit. But that aside, you attack a religious day school and you are the one asking for trouble. If it were a mosque or a black church it would be national news.
Though if I recall, the JDL - Jewish Defense League - was founded in LA back in the day. They’ve either disbanded or gone silent. And there are also a lot of Israelis in that particular neighborhood. So not totally surprising a few people are on alert.
No idea why these ignoramases thought marching on a synagogue and day school was a good idea. You wanna protest, go to city hall. You want trouble, go pick on a religious or ethnic group. You just don’t do that in LA you will be met by the other side in force.
JDL was founded in NYC in the ‘60s by Meir Kahane. There was an LA guy that headed the group after Kahane moved to Israel. They still have a website, but have been inactive for years.