I don't understand the underlying presumption that data and statistics are how you deradicalize people. People become radical when they really want something they feel they can't get, and the most effective way to fight that is to offer some of what they want. There's no argument that can prove your father isn't allowed to want less immigration, even if you and I might prefer more.
It's a genuinely hard problem, of course, because there are lots of people in the Democratic coalition who are radicalized the other direction. They feel - equally genuinely, and equally strongly - that excluding or deporting an immigrant is a grievous moral wrong which we can't tolerate for mere political expediency. That's what it means to say that there's not a consensus on immigration.
It's a genuinely hard problem, of course, because there are lots of people in the Democratic coalition who are radicalized the other direction. They feel - equally genuinely, and equally strongly - that excluding or deporting an immigrant is a grievous moral wrong which we can't tolerate for mere political expediency. That's what it means to say that there's not a consensus on immigration.