In 1984 our family travelled through Bots and back then "Baby Huey" was doing the same thing in Savuti. He would target food chests, standing on them till they popped and go for fruit or sugar etc. He would also open the garden taps himself and drink water. The camp wardens would then drive him off with a tractor.
Some say it is because tourists feed them and they become familiar, others say their keen sense of smell leads them to the source of food.
Baby hughey was also shot a year after we were there for the same reason.
In Damaraland in Namibia every odd year or so a tourist gets trampled by a desert elephant when they set up camp across an elephant path or accidently walk between a mother and her calf.