People see homelessness and open drug use and petty property crime, filter it through their ideological lens, and amplify that into feeling that they are themselves somehow less safe. You can assert that that is rational, but it's as connected to reality as someone feeling afraid when e.g. a black person is walking behind them.
Saying stuff like "a lot of [violent] crime goes unreported" is straight up fanciful thinking, and leads one to make claims that aren't falsifiable. People aren't reporting assaults? Sounds completely absurd.
