Don't fool yourselves. It is the same thing on both sides of the border. I work on the Texas side on occasion from Brownsville to El Paso. Places like Roma, La Joya, Rio Grande City, Fabens, San Elizario have the same activity going on. You just aren't hearing about it. KRGV in the Rio Grande Valley does a fair job of reporting the goings on but they use different terminologies or say "the murder is under investigation" and you hear no more about it after that.
It would be foolish to believe that a border as porous as the U.S./Mexico border could separate crime or corruption when human and drug smuggling is common place.