I assume that bad cops do exist everywhere but you should check on how london police are taught deescalation.

US and UK cops are not the same. Granted civilians don’t usually carry guns over there but i have seen footage (sorry cant find it) where they dealt with a confused person holding a knife and they just calmly talked them into putting it down with no force whatsoever.

Its probably very country specific though, depending on both recruitment standards and amount of training.