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The path of least resistance before 9/11 was our southern border. But there is no such thing as "sealing" a border. Especially not a 1700 mile long border. And even if you could, then you'd have to seal our northern border. Then you'd have to seal our coastlines, and the Alaskan borders and Hawaii. I'll repeat, you CANNOT seal our borders. The reason we haven't suffered a terrorist attack since 9/11 is a combination of hitting them first where they live, and monitoring their actions within our borders to limit their ability to operate. And our efforts have been 100% successful despite not sealing our borders.

Crossing into this country by sea is the path with most resistance. It is much easier to walk across a border than to paddle a boat (Not to mention your ability to hide is gone).
You are correct in that we cannot "seal" the border but, we could do much better than what is being done presently.
As of now, we have been 100% successful (nothing has happened)but, I can't attribute it to the great security on our borders.
Mexico is no friend to the US. Heck, their gov printed comic books telling its citizens how to illegally enter our country and get social services.
When the President says things like, "Mexico is our friend", I cringe... For obvious reasons.