Well, Wine is one of those things that happens, like it or not. In many cases one really cannot do much to prevent it. In one sense, "wine happens"
Why? most fruits have both sugar, and wild yeasts, and sometimes wine will actually be made inside the berries of some fruit bearing trees. I've seen drunk birds personally and there are youtube vids of drunk elephants.
But wine is a temporary stop on the way to vinegar town.
All we can hope to do as wine makers is coax along what would happen normally into something that tastes nice, and will last in that wine phase for a long time.
I am not an expert, but I sure do enjoy making wine.
Cheese is my mistress, but wine is my wife.