And even if it's a slow speed accident, who cares about being right if you get a disability in the process? It is safer to let them through so they don't plow into you when you have to suddenly stop.
The only reason to LARP as a highway cop is just ego.
in the wise words of reddit: ESH (everyone sucks here)
Don't let the people win, but also do not suddenly assume powers you do not actually have.
Essentially, plausible deniability but on the road. You might really just be a slow passing slow lane changing driver.
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The goal is to reintroduce friction into everyday life to nudge people into being less antisocial and/or make them slightly suffer for being that.
The goal is not to become a vigilante.
One brings a stable society, the other just a different flavor of the same chaos that came before.