It's not just about illegal immigration. The fact you know the stats on overstayed visas tells me that it's not the same issue as being undo ented.
Pretty sure the visa folks are not undo ented. The overstayed visa thing is the "But Chicago" angle for the left on this issue. If the bigger issue is overstayed visas, it doesn't mean undo ented border crossings isn't a big issue. In order to get a visa, you have to be do ented. I am sure the roads have plenty unlicensed drivers, uninsured drivers.... all of these are separate issues. So no need to bring up do ented illegals to counter measures to prevent undo ented ones.