Thank you.
I am a former school principal. No matter how much you explain things to young people, sometimes it's not enough. The idea of putting up a sign or signs to set boundaries or restrictions may seem ridiculous, but young adults and adults alike could better understand the meaning, importance or symbolism of it all.
Personally, I would encourage you strongly to do this. Just because a 25-year-old adult does something stupid on such a symbolic monument doesn't mean they don't have the mental age of a 15-year-old. That being said, I really like this idea and I think it's mostly about education in this area.
Your paper alludes to the Inuksuk memorial, dedicated to Afghanistan veterans, which was also desecrated or vandalized, 10 years ago. What struck me about this was that those who did the deeds were known, but no one was held accountable.
Do you have any more information on that? Why weren't they held accountable?