I'm there too, and yet, if someone I know and trust laid out some lines of coke he/she told me they had been doing with no unexpected side effects, I still can't with absolute certainty, say I wouldn't find myself rolling up a fresh bill or cutting a piece of one of those big McDonald's soda straws.
As for the "porous border" propaganda, the amounts the cartels ship into the US are carried by trucks and ships. And they are shipping, not sneaking in a kilo here and there. Billions of dollars. Money they spend buying everything from trucking companies to judges and politicians. You are only deflecting and disguising the real issue if you are politically advocating a radioactive wall of concertina wire or whatever. Look no further than Prohibition if you need a lesson on how trying to curb drug use by cutting supply works out. Demand will find supply, and the people who can influence the how and when of supply get very rich.