This extremly resistant and deadly bacteria didn't start out being resistant. Over many generations of bacteria, some where along the line there was a mutation that made that on bacteria more resistant than the rest, which also allowed to pass on it's resistant trait to it's offspring.
When you first get an antibacterial infection and it last a few days long because it is a little more resistant, you don't really care since it does eventually leave. But if you don't all of your antibiotics, a few extra days with a cold will be the least of your worries!
University of Chicago Press Journals. "MRSA Cases in Academic Hospitals Double in Five Years." ScienceDaily. ScienceDaily, 26 July 2013. Web. 16 Mar. 2015.
If the bacteria is left in your body untreated than it can lead to serious problems, such as: infections found in the blood, spinal fluid, or deep tissue, which may lead to death
University of Chicago Press Journals. "MRSA cases in academic hospitals double in five years." ScienceDaily. ScienceDaily, 26 July 2012. <www.sciencedaily.com/releases/2012/07/120726180309.htm>.
Thankfully, scienctists have found a way to use viruses to fight the resistant bacteria. Although there are a few complications with this process, it has helped saved many lives.
Chu, Jennifer. "Using Viruses to Kill Bacteria." Technology Review. N.p., 15 Apr. 2008. Web. 16 Mar. 2015. <http://www.technologyreview.com/news/409905/using-viruses-to-kill-bacteria/>.
This epidemic has shown the public the negative effects of overusing of unnecesary antiobiotics and allowing the growth of bacteria to become resistant. Although this disease was a tragedy, it served as a wake up call to the world.