There are some topics which are ALWAYS going to elicit strong and angry reactions from people. Ethnicity/racism being a prime example. The excuse given for the march - 'illegal building' is nothing more than a ruse. Do you think if a group of Palestinian's marched through West Jerusalem protesting against the presence of the Jewish majority, we would not see a similar response from the residents there? If the Pals WERE stupid enough to try this, they would probably get about as much support from the rest of the civilised world as Gvir and Marzel have, i.e. NONE. Kicking a hornets nest is NEVER a good idea.
Russia says kills six suspected militants in North Caucasus (Reuters)
from the article: Clashes erupt as extreme rightists march through East Jerusalem