The context was a discussion of human "Fertility Laws" which (in Niven's universe) people put up with but which startled the alien.
It brings to mind an interesting question: Is there a law that would make Americans rise up more or less as one and summarily remove the lawmakers? (Tar and feathers are traditional.)
I'm trying to think of some usurpation that would simultaneously gore enough people's oxen to get a majority angry. The only thing I've come up with so far is banning cars, and even that issue has a powerful constituency supporting it (for the peons, of course). First amendment, second amendment, 4'th, 5'th amendment, 6'th? Nah. Spending money without budget, oversight, or limit? Nah. You only get half the people interested, if that much.