So you're implying these people didn't know the storm was coming? They didn't know the severity and neither did the weather service.
During a July 4 press conference, Nim Kidd, the chief of the Texas Division of Emergency Management, said the forecast his office received on Wednesday in advance of the storm predicted several inches of rain, but that "the amount of rain that fell at this specific location was never in any of those forecast."
Kerrville city manager Dalton Rice reiterated that sentiment in the same press conference, saying the storms that hit the areas "dumped more rain than what was forecasted."