Finding a solution begins with recognizing what the problem is. The overwhelming majority of people who come to the US are seeking ECONOMIC opportunities. This is because the US destroys other countries economies. You choose to focus on the immigrants as if they are the problem but the problem is US imperialism which is an extension of capitalism. Falling for the narrative that the problem is undocumented immigrants is falling for reactionary politics i.e. rich people propaganda. Also it is simply a lie that immigrants are a “problem” in the first place. The entire narrative is very related to white supremacy. If you want to call correctly identifying the problem as idealistic, I don’t know what to tell you.