No, highway speed limits, at least federal interstates, have speed limits for the purpose of generating revenue.
Reckless driving is a criminal offense, not something you're fined for. Speeding fines are there to provide some disincentive to doing stupid things prior to going to jail for it.
And revenue. As minor speeding isn't really much danger at all, but a lucrative cash cow authorities have become accustomed to suckling the milky teats of.
You'll find speed cameras and cops hitting motorists hard in places where people are likely to speed, and there for generate maximum revenue. But conspicuously absent at notorious deadly accident blackspots where there isn't a high volume of traffic.
If the primary goal was to save lives by slowing people down. Using first principals, where would you decide to put a speed camera?