I get similar things happening at the Towers, although the messages scrawled around my portcullis are usually along the lines of "If you come anywhere near my wife again, I'll torch your gonads".
For a time after his passing, it was nice that fans had a place to leave messages.
But this is now a woman's home and she deserves to have her property left alone. It is obviously discouraged and unwanted now, so all of these 'fans' who continue to vandalize Freddie's closest, dearest friend's property are disrespecting Freddie as well.
If you feel you must express feelings about Freddie, write or draw what you need to and publish it on the internet.