It is exactly what you suggested. I take it you're offering a comment on your own competency to make military judgements.
You raised the spectre of an invading army using these roads. I pointed out what happens to an army in the open on roads in this day and age.
That's why advancing campaigns usually win wars whereas retreating/fleeing (cut and run) campaigns usually fail.
I'm sure that any surviving members of the German Sixth Army would offer to disagree.
You are confusing cause and effect.