I totally agree that if you want the sound of a gut-strung bass there is absolutely no substitute. Nothing, not Velvets, not Evahs, sounds anything like a gut string. But not everybody wants that gut sound. And the sound of steel or synthetic strings is not impure, just different. Hey, car engines were originally built with carburetors; that does not mean a car with fuel injection is wrong. It's progress.
Like I said earlier, I like gut strings. I also like metal and synthetic strings.
Peace to you too my friend!