Increased speed limits in BC increased fatalities: https://www.cbc.ca/news/canada/british-columbia/fatal-crashe...
Road Safety Impact of Increased Rural Highway Speed Limits in British Columbia, Canada https://www.mdpi.com/2071-1050/10/10/3555/htm sustainability-10-03555-v2.pdf
https://icsw.nhtsa.gov/nhtsa/fars/speeding_data_visualizatio... 27% of fatalities were speeding-related
“There is a great deal of evidence that if you drive just two percent faster, your risk of being killed increases by 10 percent,” https://www.autoblog.com/2010/06/23/speeding-health-hazards/
Moreover, traffic flow is worse at higher speeds, and there's more pollution, and it's louder. And we have to spend more money on roads.
If one were to want to drive fast, the best place would be a race track.