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Except immigrants also increase demand.

They increase demand for products (certain products that are local only to the destination country, not things they would buy anyways like a cellphone), but not jobs. Increased workforce will increase supply of labor much more than it will increase demand for that labor (which I can't think of a direct route which would cause that, except for general economic boom leading to more businesses, but that's pretty indirect)

That is a bunch of completely unproven assumptions. Of course immigrants increase the demand for labor. Even the illegal ones.

You can't think of a direct route? Try the obvious ones: Who cuts their hair? Who fixes their car? Sells them groceries? It's even more obvious for legal immigrants.

What's wrong with a general economic boom?

Great for haircut salons: you get cheaper labor with an increased labor pool and you get more customers!

Not great for the previous employees of the haircut salon.

I'm not convinced that the increased demand for haircuts will outpace the wage loss that came with increased competition for that job.

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