I don't know that going in and re-editing older works (often without the input/participation/consent of the original creators) to conform to today's standards (whatever those may be) is a particularly ethical or worthwhile endeavor.
Almost any older movie could contain something that might offend someone. Scrubbing them from the record could be a dangerous path to go down.
Warner Bros. handled this sort of stuff the exact right way with their presentations of the various controversial Looney Tunes shorts by supplying historical context, modern analysis, and then the unedited piece of work.