Casino establishments have security so this kind of harassment can be reported through the security. Aside from that there are lots of people to witness such crimes so I guess people will not do such things in the open. Unless they had this target in non-cctv places (which is impossible) and probably outside the premise of the casino. Unless the woman willingly mingles with these people and then gets harassed or taken advantage of by other people, I believe the casino can cover the security of each of its players inside the premises. However, I agree with you that it doesn't harm to bring more people since the more friends enjoying the casino services the more fun it is plus there is safety in numbers.
In the Casino,the gender can give the equal right.But the crime was key factor to not allow the woman to the casino.Because as you said,the people use the non cctv area to encounter some crime.So some casino not allow the woman to their casino site only for the security purpose for the woman.Because man can handle any type of crime and woman only able to face the harassment in the casino.Some men in the casino itself take advantage over the woman,when she was drunk in the casino.