On the other side of the pond on 9th of July 1982, an unemployed painter-and-decorator called Michael Fagan climbed over the fence at Buckingham Palace, shinnied up a drain-pipe and wandered about the interior eating cheese and crackers and swigging from a wine bottle which he found on a table. He appeared in Mrs. Windsor's bedroom at 0715 hrs asking for cigarettes. Herself left the room and came back after some time with a footman and two police who arrested Mr Fagan. He was committed for six months psychiatric evaluation. I guess the sentences are roughly equivalent but Mr Fagan was not in danger of being shot to death: that would make an ugly stain on the carpet.
The leftist Prime Minister of Sweden Olof Palme was killed as he walked home from the cinema in Stockholm on the night of 28 February 1986. Democrats
So much for security for citizens and Heads of State. I've mentioned some failings in security w.r.t. paintings, especially one of a handful called Skrik or Der Schrei der Natur or The Scream. Antique maps can be priceless like a painting but can be stolen for sale by people sufficienty avaricious, daring and well-connected. Slightly over 20 years ago Edward Forbes Smiley was convicted of razoring nearly 100 rare maps and removing them from libraries and museums. He was only nicked when he accidentally dropped >!clunk!< a craft-knife on the floor of Yale University's map room. He was sentenced to 3.5 years in jail and fined $2.3m. The response from librarians and curators was summed up by a quote from one of their number "we are in the business of being vulnerable". I like that sense of balance: there is no point in having cultural treasurers locked in steel cages in cellars where no scholars can read them or use them for research.