The disconnect comes in when politicians and people like you tell people who are against illegal immigration to forget the facts they see with their own eyes,and forget the reality of the loss and suffering they experience on a daily basis from the effects of this no border insanity.
. They don't have to get the facts from some politician , political group or some scientific group's, government-paid-for pack of lies.
You need to understand that the final arbiter of the facts is the court.
If Congress creates legislation or the President creates policy based the facts as they are known at FR or VDare, that legislation/policy would not withstand a legal challenge because the court would not recognize FR or Vdare as credible sources.
OTOH, if Congress creates legislation or the President creates policy based facts from the Fed Reserve Bank, the Dept of Labor or Justice as well as NGOs such as Pew or Heritage, that legislation/policy would withstand a legal challenge because the court would recognize these organiztions as credible sources.