Sure, you can. In the abstract, this is a perfectly reasonable position to hold. But if you're actually coming from a place of wanting rational policy responses, then you would have gotten off the Grump train years ago. Or at the very least (if immigration is really the one single issue you're concerned about), then as it became apparent that even the immigration narrative is performative kayfabe as well (many of the despotic "executive orders" are failing in court since there hasn't been legislative action on immigration. the straightforward conclusion is that the ultimate goal is for them to end up failing).

Having been skeptical of the racism explanation for quite some time, I've come around to it. Of course racism isn't the only thing that remains (there is also religious fundamentalism, spite, grift, etc), but it is a large chunk of what remains. I find the analogy of how communities destroyed their own public swimming pools as a response to desegregation an apt comparison.