In some ways they are revealing the truth.
"I'd started the path thinking that home was the stone walls that surrounded me...after what we'd experienced we knew that it wasn't, that home was a state of mind"
It's not just home, it's reality that is a state of mind. Escape life's unpleasant realities by pretending that they don't exist.
Most people do this to an extent - we procrastinate, we hide from difficult decisions. However, the Winn/Walkers seem to have taken this to pathological levels, leaving chaos in their wake.