in a world where cars are not allowed to go fast, public transport would get dedicated tracks where it can go faster. even with busses there would be less traffic because a bus can carry a lot more people than many cars. therefore it would be much safer for pedestrians and the goal of reducing accidents would certainly be achieved.
Even the most ardent believer of this fallacy will often break when confronted with real costs to their own life.
For example:
Cruel Capitalist: If lowering the highway speed limit to 40 miles per hour (64km/hr) would save 20,000 lives per year on US roads, should we do it?
Bleeding Heart: It would be inconvenient, but yes, it would save lives!
Cruel Capitalist: And if lowering the highway speed limit to 20 miles per hour (32km/hr) would save 40,000 lives per year?
Bleeding Heart: You know, maybe some people just aren't meant to live that long. Isn't the planet getting overpopulated anyway?