לקדש שם שמים

לוי & פנחס, both risked their lives by being קנאים (zealots) where  immorality

was involved, yet פנחס was praised for his קנאות  and לוי was ostracized 

for his קנאות 

The Netziv in (שו"ת משיב דבר (ח"א מ"ד  explains that practising קנאות

should not be done even by Chasidim who are doing it for the sake and

love of Hashem. It may only  be done  by Talmidei Chachamim using

their הגיון תורה (Torah logic- Hashkafah)

They are the only ones who know and understand the very minute and 

precise details as to when to be מקדש שם שמים by going out and fight 

for the cause and when to refrain from קנאות to avoid 'חילול  ה.

Perhaps according to the Netziv, in the future, if & when there will be 

a need to stop the traffic and Egged buses  on Kikar Shabbos, they

should have the Ziknei Roshei Yeshiva sit down in the middle of the

street instead of 14-year-old Bachurim.