

If people think it’s safe to go past a school at 50kph, that road is built improperly, or the school is built on the wrong road.
Your using people very broadly there. Some people see a narrow street next to a school and think a reasonable speed is 30 kph. Some people see that same road, don’t notice the school and judge they can go 50kph. That second person needs some enforcement to discipline them otherwise they’ll keep using their metric for safety, which is far from what a normal person would measure, much less a traffic safety expert.
A regressive tax on the poor would be increasing taxes on everyone including safe drivers and non drivers to make all the changes to the roads necessary to get the same amount of accident and fatality reduction that you get with adding speed cameras.