That Peru study is interesting, thanks for sharing that!

The antibodies wear off at different rates, so ensuring there is constant coverage is key. Also, the risk for pets are higher because they don't know what rabies are so they aren't going to avoid rabid animals. Another factor is the cost to test for those antibodies. I have received a bunch of polio shots because the same reason, and cost of the shot is a fraction of the cost for the test to see if I still have the antibodies, so my work mandates I get the shot just in case.

Also, rabies is an incredibly deadly disease. There has been only ONE documented survivor of rabies in all of human history and they put the victim into a coma for a month as a last ditch effort and it worked, although I think they still have serious brain damage. Rabies is NOT something to trifle with.