What about them? That they exist? No one disputes that. That illegal immigrants cause crime? We have hard data on that; it's not true. That they are a drain on society via social programs? We have data on that too; they get taxes witheld but cannot claim refunds and cannot enroll in social benefit programs due to their lack of SSN.
On any topic you want to pick it's typically the radical right wing who have their fingers in their ears.
The people who think illegal immigrants shouldn't be illegal don't think anyone should be illegal. What's the double standard? It's not like they think black people should be allowed in but white people shouldn't.
What's hard to grasp is how you think this applies to a discussion about differing facts based on political leaning. Nobody disagrees with the facts here, only on what should be done going forward. So, not really relevant to the discussion.
On any topic you want to pick it's typically the radical right wing who have their fingers in their ears.