If you go back to the OP and the purpose of this thread it has everything to do with everything. DallasLV426 made the point that this incident pointed out theses were the type of 'bad hombres' Trump was talking about and how this incident helped justify the wall.
Fact is, in 25 US cities you are more likely to be murdered, manslaughter, raped, beaten or robbed than in Mexico as a whole. In 50 US cities you are more likely to be manslaughtered, raped, beaten or robbed. In the US as a whole you are 200-800% more likely to experience a violent crime in your lifetime. Close to 2000% more likely to be a victim of any crime. Lots of countries are worse than the US, I'm just pointing out that people are wrong about their assumptions about Mexico.
Point: There are "bad hombres" on both sides of the border and the wall will do little to reduce either statistic, nor will it help reduce the root-cause drug problem. Trump should be less focused on building a wall and be more focused on reducing crime on both sides of the border. Much of the Mexican crime problem was made in America. Reduce the drug problem and the crime goes down