youre kidding right? sunni and shia, as well as catholics and protestants, have been shedding blood for hundreds of years. the only common aspect is that all three are religious quarrels. these are the actions of a few that do not represent all "ultra orthodox " jews. unlike the other two that you mentioned, this conflict is not condoned by any respected leaders from either side. while the rabbi mentioned failed to condemn the incidents, he wasnt supporting any violence. In contrast, shia and sunni leaders are very divided. they are in different countries, for the most part, and wage violent wars on each other killing thousands. protestant catholic conflict still continues in a few places but even somewhere like scotland has over 50x the amount of violence or this type of nonsense. This doesnʻt even touch the surface.
Woman moderately wounded by firebomb thrown at her car in north J'lem (Haaretz)
from the article: Wave of vandalism hits non-Orthodox synagogues anew