It's pretty much a certainty that when right wing Jews march in protest through an Arab town there'll be trouble. It's also pretty certain that when secular students march in protest through an Orthodox neighbourhood there'll be trouble. It's not rocket science. So either permit both, and put the police on guard, or permit neither.
In Qatar, Kerry seeks to convince Gulf Arabs on Iran deal (Reuters)
from the article: Police refuse permit for secular student protest in Bnei Brak