Couple of comments:  First off the symptoms described are exactly those that I myself feel when I ingest a large amount of alcohol quickly.  Disorientation, black out, memory loss.  It may be that the bartender's sin is putting lots of booze in the drinks rather than diluting them with mixers.  Some patrons and some bartenders think giving lots of straight booze is a favor.  Second, normally, a person needs a motive.  It appears that the bartender did not approach or take advantage of the women affected.  It is hard to imagine a motive.  Third, it would be very important if the women involved knew each other or had prior heard allegations of misbehavior by the bartender.  Very strange.  As usual, many commenters here project their evil selves on to the bartender and believe that just being accused is proof of misbehavior.