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Because in this society, where vengeance is prevalent, Feng Jun is entitled to seek revenge since he was schemed against despite not being at fault.
And because the Gu Family's methods affected innocent civilians and were extremely brutal, Feng Jun is allowed to kill a few more people when he takes his revenge.
Of course, even then, after he has killed people, he still has to explain the situation to the Official Government, and he might even have to pay a fine or something.
However, as an Innate Expert, as long as he has sufficient reasons, the Official Government will not intentionally make things difficult for him.
It is precisely because of this that when Feng Jun sought to take revenge on the Gu Family, various powers followed suit—even the County Soldiers were dispatched by the Magistrate.