It is not a good idea and here is why.
The story in the UK regarding the man that shot himself in my opinion was intentionally sensationalized for the very purpose of making the point the
OP seems to be in favor of.
Public opinion can be easily swayed yes however there are those amongst us that can see the this story like the many others surrounding it (relating
to gun crime) are hand picked for the public to digest and as a result be conditioned into accepting the need for more imposed security laws.
What this does is it puts the power and control more into the hands that use fear against us to gain an advantage. Arming the police will only
increase the fear in the public eye although not on a visible but subconscious level.
Guns full stop are not the solution and more of them on the streets means more dead people.
What governments really need to be focusing on is how to address the issues that create crime in the first instance.
Perhaps there is a more pressing illness within society that needs to be looked at!?
Personally i feel the OP has an agenda and is in some way connected to the secret organisation of condition agents.