Keeping the neighbor kids and stray dogs off your property and keeping people out of a country is not comparable. You might argue that your hedge keeps murderers, burglars, rapist and vandals out, but I doubt a hedge or fence or even a residential wall is all that effective. Like I said fences mainly keep things in, including your privacy.
Idealistically, I am not against controlling illegal immigration. I don't support Trump's wall because I doubt it will do much good or that it will even be completed. What's more, it is costing taxpayers dearly.
And the Peace Walls in Nothern Ireland - they work & are still in place, the residents don’t want them to
Come down as scared the troubles will escalate again. They’ve been up longer than the Berlin Wall was.
Talking of Which was the Berlin Wall fairly Efective ?
Or The Great Wall in China ?
Hadrian’s Wall ?
What about The Wall in Jordan ? paid for By Obuma
I could go on & on - Simple They Work - of Course you’ll always get the odd one through,
Only The vast Flow will be Stemmed.
And illegal immigration isn’t costing the American Taxpayers

Weak really weak argument you have this Time.