Even at 40 mph if you hit a pedestrian there's over an 80% chance you'll kill them so we really shouldn't have people going 50-60 mph in areas where there are pedestrians at all.
stop cuddling everybody
If you have poor infrastructure, no crosswalks with lights, no separated bike lanes, cars that run red lights then sure, go ahead, go fix that
If some idiot jaywalks on a main road with proper safety infrastructure and gets himself killed, it's his problem