Fences Don't Stop Tunnels

The title is simplistic but sometimes the truth is very simple. A tunnel was recently discovered near the Otay Mesa point of entry in California that was being used to smuggle people. That part of the US-Mexico border already has a "wall," actually a double fence. If Trump's wall ever gets built, it will do nothing to stop other kinds of smuggling. It's so obvious but Trump's supporters really are that stupid.