I think a lot of confusion stems from real income versus nominal income. If wages drop, but prices drop further you are better off. If protectionism increases wages but also prices, no gain is made. You cannot legislate prosperity. But many don't see it this way as they think in nominal terms. While you may think you can somehow get protectionism for your particular industry and none other, this is never going to happen. You are never the only one trying to get advantages.

The free market does not cause scarcity. That is why protectionism is sought after.