why do pathogens evolve faster than other bacteria?

Question: why do pathogens evolve faster than other bacteria?
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  bacteria
  
  evolution
  
  pathogen
Asked by Ghbarreiros to Daniela ?, ☣ Danna, Jonny, Juan on 22 Jun 2016.
- Jonathan Hunter answered on 22 Jun 2016:
  
  Pathogens are bacteria. I think the evolve at the same rate however because we are more aware of their presents it seems like they are evolving faster.
  But this is not my area so maybe the others can answer this more accurately.

Question: why do pathogens evolve faster than other bacteria?