Yes, there have been cases where an obviously unjust accusation or a trial that tried to establish or protect powerful interests was derailed by jury nullification (John Lilburne comes to mind). His defenses and his treatises about justice and law are important documents, and they are still quoted. But jury nullification didn't help him avoid unjust imprisonation, and with his rhetorical talent and the immense support he had in the population, any conviction would probably have been overturned or nullified anyway for political reasons.
People are talking about problems decades WAY past the point of inception. Its like saying in 1900 that we certainly cannot have cities full of horseless carriages. People would drive into each other, run over one another, etc. These were problems they already had with horse and buggies, extrapolated to the worst extreme. Yes it can and would happen, but not to everyone and not everywhere you go.
This is a little bit ahistorical, as road signs and other traffic regulation is older than horseless cars. In the second half of the 19th century, London had the first road signs put up because of the increasing number of accidents involving bicyclists. When Carl Benz had his first horseless carriage ready, he immediately got handed down the first speed limits by the City of Mannheim: 4 mph within city limits, 8 mph outside. He later got the limits lifted by inviting some people from the city council for a ride on his carriage, and when even a milk carriage began to overtake his horseless one, they asked him to go faster, and when he objected because of the speed limits, they lifted it while still on the carriage.
In the Graenlandinga Saga, Bjarni Herjulfsson travels to Greenland, and the description in the Saga fits today: Mighty glaciers, mightier than those of Iceland, cover much of the land, and only a few green stripes were to be seen at the Western coast. The name Greenland is called bogus and chosen as an euphemism in the saga.
Columbus' travel was about the circumfence of the Earth. While most scholars in the 15th century estimated the circumfence to be about 26,000 miles, quite close to reality, Columbus was convinced it was only 15,000, making a travel westward to India to seem actually feasible and shorter than the Portuguese way around the Cape of Good Hope.
If all else fails, lower your standards.