Anybody who says a 30 foot high wall won't do anything needs to use some basic thinking, not critical thinking, just basic thinking.
I saw somebody post how a wall won't do anything, if anybody wants to get in hard enough, they will find a way no matter what. Sure, some will find a way, but to say that the 300,000k+ a year that sneak in southern border would not be reduced is faulty thinking.
I told them there is a concept called too hard and deterrence. I told them if they really believe that, to empty their savings and bank account and put it all in a clear plastic bag and lay it atop their car. Based on their thinking, there is no point to put your money in a bank or keep it in your home behind locked doors. Because it's inevitable that whoever would be willing to walk by and pick up a bag of money without getting caught or seen, would also be breaking into their home, do identify theft and empty bank accounts or steal everything in their home. If somebody will pick up a bag of money, then that means they'll also just rob a bank. Risk and difficulty wouldn't make a difference.
But anybody who has basic thinking skills will realize that a 30 foot wall and better security than having nothing will deter people from attempting and make it easier to get caught as well. A person tossing their 2 year old toddler over a 10 foot fence probably wouldn't toss them over a 30 ft high wall.
If walls don't work, then why don't prisons tear them all down? Prisoners if they really want to escape, a wall won't keep them in will it?
In economics, one is taught that the higher a price, the lower the demand. The lower the price, the higher the demand. The harder to sneak illegally into a country, the less will try to do it and/or be successful doing it.
Then you also have idiots who say that more people extend their visitors visas then sneak in southern border. Those who enter by plane or boat must pass customs and have documents. We know who they are. Those who sneak in southern border without any documents we have no idea who they are, if they had been dangerous criminals previously deported, etc.
I really do wonder if liberalism is a disease like people claim. Or just for absolute idiots. These points I made seem like they should be common sense that anybody in the human race would easily understand.