Could the map's creator be held liable if Flock can demonstrate this map in particular was used to destroy cameras?
Highly unlikely (but hey, anything's possible when you're flirting with an authoritarian regime). They would need to demonstrate that the map was made TO destroy cameras if to have real merit.
In my uninformed opinion that would be a dangerous precedent if there is no proven collusion or conspiracy to act together. I anal though so I'll wait for people who know the law to respond.