"not what most people, in my opinion, want to see at any SAM."
And that's the clincher.
If it was put to the vote it would come out "no littering in a public place thankyou" and no amount of looking in the dictionary would change it.
Tonbridge and Malling council made a big deal about roadside flowers for deceased pedestrians, claiming it was unsightly, messy, smelly, and non-perishable. The same rule should apply, with a little commonsense.