Make no mistake about it -- an eruv is not an intrusion of religion into the public sphere any more than church bells on Sunday, or an advance of religious extremism. It's simply a system of wires or train tracks you could not see if you were not looking for them -- guaranteed -- that allow religious people a couple of comforts such as pushing a baby stroller to synagogue.
So, in this city -- in which Looney Toons are not only tolerated but often enabled -- it's nice to know that a simple gesture such as this didn't involve frothy-mouthed declarations during public comment sessions that the Jews are coming to take your possessions or bringing up how this is somehow related to what's going on in Gaza.
By the way, don't think this is a paranoid delusion: When Palo Alto's Orthodox Jews wanted to gain recognition for an eruv that was already 90 percent extant via telephone wires and creeks, enraged NIMBY activists claimed that the creation of a symbolic "communal space" was actually a secret plot that would allow Jews to barge into strangers' homes and put their feet up on the tables (I am not making this up). Rabbi Yitzchok Feldman was called "a Zionist conspirator" for his efforts. After eight years of joy, Palo Alto approved an eruv in 2007.
Incidentally, the boundaries of San Francisco's week-old eruv are Kirkham Street on the north, 20th Avenue on the east, Santiago Street on the south, and 44th Avenue on the west. Be sure to mind the wire when pushing your stroller from Friday sundown to Saturday sundown.