You can use the same skills to spot when a news article is trying to manipulate you.
> What am I ever going to use my knowledge about Roman history for?
You can see how empires fall, and vote against those things.
> What am I ever going to use my knowledge about the structure of our government for?
Understanding why things happen around you is the first thing you need if you ever want to try and change something you don't like.
> Certainly no employeer of mine ever cared, my University didn't care, nobody seems to have ever cared, except my teachers.
You might care, though. Or you might not know what you know now without them.
Thankfully you did all those things, so now you can write a well-written letter to the correct person in government, citing the parallel problems with the current education system and the fall of Rome, and stop children being taught this stuff (-: