Well with switches like that where everyone is rushing to try to get there asap its rather hard to pick out in a crowd who actually pushed the lever. In sorrento its always crowded as everyone there is trying to get on the boat before it leaves. Its hardly sabotage anyways, no one pulls the lever for the boat to kill the people behind them, they do it to ensure the boat leaves quickly so they can defend the gates. If you are not fast enough its kind of your own fault, it is similar to not opening a barricade to let someone who was too slow into your cade.