Times and opinions change.
Agree that violence can lead to violence.
Daily movies on tv or internet, full of violence, it surely has impact, but most people still know how to behave. But there is a difference between violence and a soft! physical correction, which works like a shock therapy. The risk of being punished, in case of crossing boundaries, can be enough warning.
In Europe we have had a significant influx of people from other countries, bringing their own culture. Some of the 2nd and 3rd generation do not behave and show a lot of disrespect towards others. In the countries, where theiir parents came from, the police will use violence, so people behave.
In Europe several youngsters swear at police officers, threaten people in the street.
I would not object that this riff raff is confronted with real violence from the police.
The ones who do not like to listen have to feel.