Yes, in the meantime that you and I and the rest of our politically and technologically savvy demographic are exercising our darwinian news filtering improvement capacity, millions of less globally aware, less up-to-date and less capable, given other more present temporal, logistical and emotional burdens, are still going to vote with whatever news filtering skills they have at the moment

I agree that the problem is that filtering out the truth is hard, but creating an arbiter of truth also has many other problems. Whoever gets control over the arbiter can shape the truth top their liking. Right now what we view as the truth as a society is shaped by the sum of everyone speaking out, but if you think you know better then you can simply override it. Others might disagree, but you're still encouraged to think for yourself rather than rely on someone else.