content: No, they aren't afraid that he'll dismantle mass surveillance, but that he would abuse it.  The position against mass surveillance should not depend on who is president - it should be a principled stance.  It can be used to target gun owners, or vegetarians, or muslims, or christians.  Mass surveillance is an evil no matter who uses it.  Snowden did a great job describing the difference between targeted surveillance (necessary) and mass surveillance.