It sounds like you're trying really hard to either: provide cover for racists, or more charitably cast good intentions on them. It's really simple: racism is hate and we shouldn't have hateful government. Also, this movement isn't organic the GOP have to manipulate people through fear or hate and fight tooth and nail to change rules just to win. America is dead at this point. It's unlikely to ever recover.
"Demographic Replacement" is such a hilarious framing of immigration that it immediately marks you as an agitator or someone with an intense learning difficulty.
In case you were wondering why you cop the downvotes its probably that.
Unless you are suggesting some kind of mass imprisonment of the people pushing that particular framing, in which case you might have a point.