https://lordslibrary.parliament.uk/trends-in-violent-crime/#....
While the rise in violent crime isn't caused by unarmed police officers the fact that they are unarmed didn't prohibit the rise in violent crime.
> The ONS reported that victimisation rates shown by the CSEW have been decreasing in the long term. They peaked in the year ending December 1995, when 4.7% of adults were a victim of violent crime. Rates have remained below 2% since the year ending March 2014.
> In contrast to the downward trend shown by the CSEW, the ONS highlighted that police recorded violent crime increased between the years ending March 2013 and March 2022. The ONS explained that these increases are thought to be driven by improvements in police recording practices
In the UK for instance most officers don't even carry guns.