If you follow this blog you may have guessed I’m a huge fan of Bryan Caplan. He has a way of structuring extremist arguments so that they come off sounding reasonable and compelling. Take a look at his opening remarks in this immigration debate. I don’t think you can do any better.
Unfortunately his opponents kept repeating the fallacy that free immigration would drive Americans into poverty and enrich the 1%. I think the final poll results reflect the scare factor.