While I don't disagree with the substance of this essay -- I think this point needs to be made, and this discussion needs to be had -- it's very difficult to offer "open forums for contentious debate" when certain speakers have built showmanship out of their propensity to offend. This fits most definitions of deliberate trolling, and isn't a productive recipe for reasoned debate, protests and boycotts by the populace drive home the point that the speaker's views are already well-known, and not welcome at all.
Similarly, some brave institutions may decide to host speakers that are near-universally condemned for views that society has decided to be abhorrent. By giving such speakers a forum, they're endorsing that such views are worthy of being heard or debated, whether they are enthused by those ramifications or not. Such behavior requires calculated risk, risk that may pay off if attitudes change in the future.
Similarly, some brave institutions may decide to host speakers that are near-universally condemned for views that society has decided to be abhorrent. By giving such speakers a forum, they're endorsing that such views are worthy of being heard or debated, whether they are enthused by those ramifications or not. Such behavior requires calculated risk, risk that may pay off if attitudes change in the future.