Why do we make cars that go 200 mph?

I’ve never anywhere in the U.S. seen a speed limit over 75 mph, although before the nationwide 55 mph speed limit there were apparently “Safe and Reasonable” speed limit signs out west. At any rate, is there any reason that cars on the public roadway should be capable of going more than say, 85 mph? Seems to me that’s about the upper limit of the vast majority of people’s driving tolerance, only a handful of people will ever go that fast, even less will be truly comfortable, and probably none truly in control. It seems to me that it would be safer, and not an undue restriction, for cars to be governed to about 85 mph. What say you?