(I'm assuming your response isn't sarcasm. Correct me if it was)
"These people" contribute next to nothing to our economy. They degrade our education and culture. They provide a downward thrust to the salaries of our neediest citizens, taking away jobs that would be full-time with benefits were it not for the availibility of cheap part time labor. They cause a situation where people are becoming dependent on others to do things they could better do for themselves. They cause pressures on housing and the environment.
Besides, with us picking up all their healthcare costs they are bound to get shots after they come over the border anyway.
And who's going to pay for the shots? There is always the danger of a mutation of a disease or of a new disease.
This article seemed to be too much of a hit piece. The disease danger is not just from Mexicans who do not wash their hands. A disease could come from any part of the world, it could affect soldiers serving their countries, ordinary tourists, the affect on unsanitary conditions in refugee camps or among those displaced by war, etc. The disease factor is a compelling one, for all of these reasons, but like most things, the government won't react until a certain threshold is reached and people get outraged. Sadly, three deaths in Pittsburgh won't be enough to stop the problem.