The creator should certainly assist monitoring the comments and reporting inappropriate comments, however they shouldn’t be financially liable for comments they can’t control. Maybe frequent inappropriate comments means comments are disabled by default.

I believe it's a combination of being proud and thinking within a silo that every possible option has been exhausted. Often impossible is a term used to describe many unknowns such as scope and depth. When a researcher does a related work search it often only covers some of the categories and sometimes seemingly unrelated work results in changes that the original researcher could not see.

There are a couple more links on this site