Why do you want a closed border?
Many reasons.
Primarily Political and Cultural.
The Political damage is the shift in demographics help the dems, and they are more and more under the control of hte worst kind of people. Hard core leftards, deeply anti-white racists and just full of idiotic ideas that lead to terrible policies.
The cultural damage is about the decline of social capital and changing our society in to a low trust society, and increasing diversity destorying our cultural ties that bind our society together.
I ask you again, why do YOU want an OPEN border?