A fair and impartial system the people trust will discourage that simply by existing, yes. Shame we don't have one of those. And so, instead of showing vigilanteism is unnecessary by demonstrating fairness, they'll show that it is extremely risky by placing vigilantes on an even lower tier of "justice".
that has ALWAYS been the primary purpose of cops and courts in the west
A fair and impartial system the people trust will discourage that simply by existing, yes. Shame we don't have one of those. And so, instead of showing vigilanteism is unnecessary by demonstrating fairness, they'll show that it is extremely risky by placing vigilantes on an even lower tier of "justice".