I feel for you, at our old house (near downtown St. Petersburg) people were constantly stealing fruit. One lady stopped and filled up and entire large shopping bag. In years when we didn't have a lot of fruit, they'd strip it clean.
I saw one neighbor rip off a large branch with his hands- when I went to confront him he said he was going to graft it by sticking it on top of a plant he had that wouldn't fruit (what a genius)
Also caught one kid on video ripping branches off our plumeria, and he stood there and de-leafed all the cuttings right in my front yard.
I finally put a "no trespassing" sign in our mango tree and our neighbor called city code enforcement because of the sign!
The best thing we ever did was move away from the urban area to a more chill laid back area of the county where people don't live like that and do this stuff to each other. For many years I struggled to try and deal with it and accept it as something I couldn't realistically change.
Many people just don't get it and will say "oh, it is just a plant!"... the plumeria that the kid ripped apart I had been cultivating for years.... imagine if your hobby was, I don't know- building miniature dollhouses, and someone walked into your craft room and stepped on one. This is exactly the same thing in my book.