Its not. It really is not at all and its this stance which is making things worse for all of us.
CRA is something we all need to understand and get our heads around. Don't be scared of it.
They can spout it all they want having been on citizens advices website and then don' some google research on honest johns forum but the long and short of it.
I sell used cars, I prep them well. Really, really well. I service them. I offer a 3 month/3000mile warranty and I don't cover tyres bulbs and breakpads during that time. I am pretty much covering everything else.
If you choose not to extend the warranty and have a problem after 5 or 6 months having covered 2000/3000+ miles over and above the period I warranted the car for then by all means I am sorry to hear that however it really is not my fault and I am not responsible. I would not get involved, I would not collect it and I would not inspect it. It is a used car and something has just gone wrong, possibly a known model issue, possibly just one of those things that comes with owning a car.
Learn the CRA, learn it some more and fully understand it.