Don't worry, I've never been clever.
Okay, you say I am lying. So what? You can keep yelling other people don't believe what they say and there is nothing I can do to stop you. But you don't seem to have any reason to think so.
You are angry over deconstruction, but deconstruction, at least in history, is about looking for the actual truth, not the stories we've built on top of it. Looking at history as it actually was means taking account of the fact that the history that we receive doesn't always match up with reality. Even when it isn't a lie, that doesn't necessarily mean it is the whole truth.
The fact that Jefferson was having sex with a person he literally owned can and should make us question his larger role, because that part is just as real, maybe more real, than all the high minded sentiments he made. The fact that literal blood was shed in the attempts of workers to resist corporate violence is a vital part of our history, especially where I live, that most people are never taught, because it doesn't fit a convenient narrative.
You can't ever get entirely out from behind your own preconceptions, but we can try, and I think that is what really valuing history, not myth or heritage, but history, actually requires.