What is interesting is that he was killed on day 13 to the Omer, the day on which there is a kabbalistic tiqun - a 'correction' - to the attribute of Yesod ShebiGevuroh, the Foundation of Might, the attribute of our forefather, Isaac . But whereas both Abraham and Jacob [Jacob to a lesser degree] were both somewhat involved in, or connected with, a battle, Isaac, the pillar of Gevuroh-Might, was - perhaps surprisingly - not.
In fact, we find him going out of his way to prevent any skirmish.
Perhaps then, it has to be the pillars of kindness and straightforwardness who are G-d's messengers, as it were, to bring justice to this world, as it says in Tehillim (149) לעשות בהם משפט כתוב הדר הוא לכל חסידיו. 'It befits His pious ones, His 'chassidim', those who work altruistically'. Those who are connected to the attribute of Might, on the other hand, dare not. This world is always conducted with a level of kindness and mercy, not strict justice. The messengers of G-d's Vengeance, as it were, have to have a pure motive.
And when those who represent Might in this world carry out unmitigated Justice, perhaps there is reason to fear for repercussions.