No one cares what you think, John.
No one expects you to do a damned thing either, so just go ahead and insert you thumb where everyone knows you keep it.
The wall would take the place of an awful lot of military manpower and resources needed to stem the otherwise unbridled flow of illegals across out southern border.
Stop them there, or prepare for internal war zones.
Gonna pay anyway, just either more money and lives later on, or spend it now to block future problems.