In Fawlty Towers, The Major is there to be a racist old ****, and for us to go - "Wow! Look at that dumb old codger!". However, stupid people (and this may shock you, but there's often a big overlap between stupid people and racists) don't get that the man on the telly is supposed to be laughed at.
They think he's right.
These racist old TV shows need to be taken down lest future generations of idiots forget that The Major's racial slurs are now unacceptable in modern society.
How did you become the judge of who is or isn’t stupid/idiotic/racist? What makes you correct? It is just an opinion. At least if these things are not ‘taken down’, as you call it, it leaves people able to decide for themselves. Or is that not allowed by those who think themselves superior?