This is not a case of one person and their individual mind with no other authority involved. They are not saying that something is so just because they said so, or just because they perceived it, they are citing the Bible.
Your perception that people are "lying to themselves" is nothing more than imaginary isn't it? Can you verify it with scientific method? Or is it just something that is going on in your mind - therefore, actually in your opinion, not real?
We live in an interactive society where people share ideas and depend on one another in life. We don't live in individual bubbles of our individual imaginations. Most of the time, I wouldn't mind if someone put their imagination before physical reality. But eventually we bump heads simply because we live in a connected society.
And yes, I know they're citing the Bible, but at the end of the day, their perception isn't grounded in physical reality. They are really just citing their imagined idea of scripture, not necessarily the physical reality behind scripture.
And my perception that they're lying to themselves is grounded in corroborated physical reality. I don't set the rules, God has already set the rules in creation of our physically real planet Earth.
And nothing I do or say or believe, can change what God has created. That which is corroborated in physical reality through testing and observation.
Nobody can change the external reality of the existance of Braille. But we can imagine differences with respect to internal imagined bedroom elephants, which is what YECs are doing. And they're taking their internal imagined ideas, and considering them as more real than external physical reality.
And naturally, as Christians, we all have the opinion that God is on our side. But at the end of the day, one side is contradicting the qualities of God's physically corroborated creation, in favor of an internally imagined perception.
And in some cases, what we imagine is real. But in some cases it simply isn't. And if it contradicts physical reality, that should be a red flag.