I didn’t know what an avocado was until I moved to AZ when I was 18. Survived just fine without them.
Besides, there is a lot of open land in the US perfect for growing avocados so no big.
I think I was 12 or 13 when I first ate avocado, and didn’t think very highly of it. Now I like them OK, but I wouldn’t care that much if I couldn’t get them. If that’s the price to pay for stopping illegal immigration, I’m good with it.