After stumbling across this term, and looking up it's corresponding definition, I find myself very dissatisfied with how it's defined.
For example, the official definition is this: 'in fact, whether by right or not'.
I first read that as saying that it means to state a fact whether it is right or not (which of course makes no sense), but then noticed it said 'whether by right or not'. So then I wondered what on earth this 'right' is. Upon further reading, from other sources, it says that it is some sort of fact that is true regardless of human constructed law, or more bluntly, it is right whether we like it or not.
The primary issue here though, is that every example/explanation of the term is far from clear, as it's riddled with complex terminology and ambiguity.
What's needed, I feel, is a very simple, down to earth example of 'De facto' and/or a definition with which the everyday man can understand.