Kerosene31
Veteran XV
It isn't just Mexicans that are problematic, there's a lot of countries south of Mexico as well. If you look at the FBI's most wanted (categories) you'll find that most of them have ties to Mexico.
https://www.fbi.gov/wanted/murders
The issue is that Mexico can't or won't properly enforce border security due to the cartels.
Let me know how many countries border Canada.......