The problem was the original poster in this thread setting up the strawman that bitcoin is for every single transaction (or even a decent fraction of them).

But to answer your direct question: because the security and processing of it's transactions depends on the security of a nation state. That nation state's security stems from the military among other things. The energy expenditure is enormous and the influence of the nation state's desires on what transactions are processed is an everyday factor. This is obvious in watching the Justice Dept. interact with the major credit card companies.