Kimstu: We’ve been over this ground before, but suffice it to say that Mearsheimer and Walt’s main thesis is that U.S. support for Israel is so wrong-headed on the basis of indisputable facts (blindingly obvious to them, of course), that American policy can only be explained on the basis of improper influence by “a powerful interest group” (to quote the two).
It’s not a varied bunch of people and organizations who differ on many things, but an evil Lobby.
*"Mearsheimer and Walt conceive of The Lobby as a conspiracy between the Washington Times and the New York Times, the Democratic-leaning Brookings Institution and Republican-leaning American Enterprise Institute, architects of the Oslo accords and their most vigorous opponents. In this world Douglas Feith manipulates Don Rumsfeld, and Dick Cheney takes orders from Richard Perle. They dwell on public figures with Jewish names and take repeated shots at conservative Christians (acceptable subjects for prejudice in intellectual circles), but they never ask why a Sen. John McCain today or, in earlier years, a rough-hewn labor leader such as George Meany declared themselves friends of Israel.
The authors dismiss or ignore past Arab threats to exterminate Israel, as well as the sewer of anti-Semitic literature that pollutes public discourse in the Arab world today. The most recent calls by Iran’s fanatical – and nuclear weapons-hungry – president for Israel to be “wiped off the map” they brush aside as insignificant. There is nothing here about the millions of dollars that Saudi Arabia has poured into lobbying and academic institutions, or the wealth of Islamic studies programs on American campuses, though they note with suspicion some 130 Jewish studies programs on those campuses. West Bank settlements get attention; terrorist butchery of civilians on buses or in shopping malls does not. To dispute their view of Israel is not to differ about policy but to act as a foreign agent."*
As I’ve said elsewhere, M&W’s attacks reflect a strategy that has failed on numerous other fronts. If you don’t like a government policy and can’t understand why your own lobbying fails, don’t question your strategies or (horrors!) your beliefs - attack the people lobbying on the other side. We’d have Nirvana when it comes to gun control if it wasn’t for the NRA, Social Security would be fixed if it wasn’t for the AARP, and on and on.
As regards "dual loyalty"charges, conspiracies by highly placed Jewish figures in American government to benefit Israel* and the like, it comes back to the key question: Has this offensive tripe benefited the anti-Israel pro-Palestinian side in any material way? Does it advance your cause, or is it detrimental?
While it is entertaining to see Kimstu worrying about being overly “politically correct”, she could also use a reminder about another tactic associated with Massive Fail - telling members of an ethnic group just what they should and shouldn’t find offensive based on one’s highly selective reading of current events and history. I have not seen Kimstu doing this with regard to other ethnicities, but perhaps I can be reminded of instances where Kimstu has chided blacks, Hispanics etc. on their lamentable oversensitivity to prejudice and how they should avoid expecting “political correctness”. 
*something posters on this board have opined that we mustn’t overlook - including our dear friend elucidator, who thinks the possibility of a grand Israeli conspiracy including government moles can’t be dismissed because after all, American Communists spied for the Party once upon a time (a beautiful combination of questioning Jewish patriotism combined with a McCarthyite Red smear).