You're quite right to say, though, that refuting a lie may
> cost more than it buys you. The locus classicus is that
> anti-Semite thing that Zionists love to deploy. If you turn
> aside to answer it, they win.
>
A lesson, it should be noted, that Zionists haven't learned in 63 years!
http://www.nytimes.com/2011/11/01/opinion/israel-and-the-apartheid-slander.html
-- "Hige sceal þe heardra, heorte þe cenre, mod sceal þe mare, þe ure mægen lytlað."