“The first thing we must do is kill all the lawyers,”
Be ye gone, fishmonger, knave!
“The first thing we do, let’s kill all the lawyers” - it’s a lawyer joke.
The argument of this remark as in fact being favorable to lawyers is a marvel of sophistry, twisting of the meaning of words in unfamiliar source, disregard of the evident intent of the original author and ad hominem attack. Whoever first came up with this interpretation surely must have been a lawyer.
http://www.spectacle.org/797/finkel.html