Why does Bernard Lewis get to say it but not Geert Wilders?

Andrew Bostom has written about how Bernard Lewis and Geert Wilders have both been critics of Islam, yet Lewis has not been targeted while Wilders has; a real irony.

Maybe I can shed some light on the reasons why this paradox, and it's all in here, including how Lewis, most unfortunately, has made claims that European anti-semitism literally influenced Islam, something Bostom himself has noted about Lewis, and how that's simply not so.

Could that explain at least a few reasons why Lewis has gone otherwise unscathed, whereas Wilders has not?