They're outraged due to recent outrage about crime, which has absolutely nothing to do with recent crime levels and everything to do with recent outrage levels. It's entirely manufactured.
Saying people are not outraged about crime, but are outraged about outrage of crime is a little silly. The other side of that coin would just be that people hear more about it and are more informed. So attributing outrage to a media coverage conspiracy is not really meaningful (not to mention difficult to prove) because people are allowed to be outraged at what they want. One could even say the news covers what people are interested in, which is a classic chicken vs. the egg case in this context.
The actual data is more important, and for many cities, it is trending up recently.