What is also missing here is that even if there is not criminal activity occurring, there is a general influx of highly anti-social behavior occurring that feeds in to the perception that higher rates of criminal activity occurring. This is very noticeable when you see people casually running red lights, driving without registration, yelling and screaming at people on the street or at the bus stop, and more. Even if I'm unlikely to be a victim of a crime, I don't feel safe when these anti-social behaviors are occurring, people are shoplifting and now going to CVS feels like going to a third-world country.
Framing this as right-wing propaganda I believe is a mistake and if you are a leftist it just loses elections for you because even if the folks who are concerned about crime levels are wrong (they're not though) the perception matters much more than reality. Denying the perception implies you deny the reality too and fewer people are going to vote in favor of candidates who tell them that what they see for themselves isn't happening.