Our association of the higher interstate speeds with “danger” in the US is just a symptom of much deeper issues having to do with people knowing knowing how to drive. Highways like the Autobahn do fine without speed limits because people know how to use the roadways. So there’s no simple “higher speed = more & worse accidents” kind of thing.
In fact, I drive many many miles on interstates on a very regular basis. And every single day I encounter very dangerous stuff. Almost none of that dangerous stuff has even the slightest bit to do with excessive speed.