Interesting question. There is a concept of "kefel" in Jewish law. When a person steals from another, the payback formula is not simply to return what was stolen. It is to pay back double (kefel). A theft of $100 would necessitate a payback of $200, a $300 theft $600, etc.
The operative logic is that the thief needs to learn how it feels to be deprived of the amount stolen. Simply returning what was stolen does no achieve that goal. Paying back double is more likely to achieve that goal.
But it is not guaranteed, since if the thief is rich and the victim poor, the poor person will feel the loss more intensely. But the message is there.
A counter boycott is not a perfect solution, but it conveys displeasure as strongly as possible.
Mass letter writing might help, but the anti-Israel boycotters are likely to dismiss these letters or e-mails as contrived. A high level meeting with the boycotters to show the absurdity of their action might help. A full page strategic advert showing how a boycott of Israel would include advanced technologies and medicines that the boycotters rely on, unbeknown to them, would be helpful, but with no guarantee of success.
Exposing the fraud in the boycott, at the same time that the boycotters turn a blind eye to terrorism and hate-mongering, might score some points.
But in the end, it is the bottom line that companies look at, which makes boycott the best of the alternatives in a messy situation. And if counter-boycott is the strategy of choice, it should be a full court press, using every social media available to make the counter-boycott as powerful as possible.
Answered by: Rabbi Reuven Bulka