I noticed you dodged the question of how to effectively stop to the vandalism, so I'll ask again.
>vandalised historic and priceless works of art
Are you referring to the paintings behind glass that weren't affected at all? I did read that some of the frames had minor damage.
I disagree that such actions require something with deterrence equal to or greater than corporal punishment to be inflicted, so I ignored your question.
You mean other than being unavailable while they were being cleaned/checked for damage?
Some visitors likely traveled thousands of miles, possibly on a once in a lifetime trip, to see the paintings, which they weren't able to do thanks to a toddler-grade temper tantrum.
That's a strange definition of "not affected at all" you have there.
Oh, do be quiet.
Trying to excuse this childish temper tantrum and exculpate the infantile perpetrators with "herp, derp, the paintings weren't damaged at all" is what was dishonest.