- encourage turn taking
- help pedestrians in the 1% of urban areas where there actually are any
- bright line rule that's easy for police to enforce
- keep people from getting complacent about cross traffic
The negative effects are
- a complete stop takes more time than is needed to ensure the intersection is clear, which is a constant daily time drain and a reminder that you are following the rule because others will punish you and not because it's a good idea.
Being lax on the rolling stops and just doing enforcement around those busy areas and high-speed stop sign ignorers seems like a nice equilibrium to keep the good effects and minimize the bad ones. Maybe nicer than we could achieve by letting the kind of people who participate in politics revisit the issue.
Do you live in an urban area so dense that you can't wait for cars to clear the intersection before you run out in front?