The school fence

Just down the road.  The primary school my son went to. I was looking at this red, green and blue - thinking how beautiful it is. Underneath the red leaves is a metal fence with sharp spikes on the top. It must be council fencing, we have the same around the allotments. 
I’m not keen on fences - especially with sharp spikes, razor wire or barbed wire.  I wonder how it affects the way we think about strangers.  Dangerous people who have to be kept out? Or are they really people more or less like us, with the same hopes and dreams?