Like do they actually, reliably effect change in the way the activists intend?
Have they worked against Israel? Did they work against Apartheid South Africa? Could they work against Trump’s America?
My hunch is that they don’t, really, but can be a useful promotional tool for other issues. Like don’t buy American is a simple message. If people will listen to that, they may listen to reasons why, which maybe could build a movement.
But on the whole I am very sceptical, and would be interested in any reasons for or against boycotts.
Sometimes they do. Sometimes they are a useful promotional tool for the cause. Sometimes they don’t work at all. How do you know which will be which? You don’t.
Every person who supports a boycott very slightly improves its effectiveness, either directly or to create more awareness of the cause.
Avoid black-or-white thinking. it does not have to “win” to be part of a change, it only has to have the chance for change or contribute to change, and we won’t know how much of a contribution it made, if any at all, until and unless the change eventually happens. It may be the butterfly flapping its wings that causes a hurricane, or it may be a butterfly flapping its wings that does absolutely nothing at all. Either way, let the butterfly flap its wings first, and then we’ll see what happens. It is neither guaranteed to succeed, nor guaranteed to fail. That’s the kind of black-or-white thinking you need to avoid. We don’t live in a world of certainty, the world is a complex place full of uncertainty. We try because there’s a chance, not because it’s guaranteed, and the chance to make a change is the worthwhile part you should be pursuing. Seeking absolute certainty from future events is a form of self-sabotage.