Remember, tochacha is halachicly required to be given; and remember a breach of tznius is not only an aveira by the person committing it, but she is causing untold numbers of other bystanders to sin by even having unwittingly seen her breach of tznius.
Joseph, while this is true, shouldnt men be avoiding places that have DDR? After all, non Jewish women could be dancing on it and cause men to sin also. So if a man was avoiding places of possible pritzut (and an arcade with dancing machines qualifies!) then they are doing something wrong themselves.