You are not a feminist if you are more concened about who bears the blame in a case of rape than you are about empowering women with knowledge so they can maximize their safety. You are not a feminist if you think that we women are so powerless that we will be raped no matter what precautions we take. You are not HELPING if you think giving woman advice and tips on what they can do or not do in order to lessen their chances of being raped is equvalent to placing responsibility or blame for a rape on the woman being raped.
Being physically weaker than men, on average, makes women vulnerable to having our bodies violated, through physical assault, rape, or both. There may be nothing we can do or say to stop a rape from happening, but this does not mean that we are powerless. The best possible thing we can do to protect ourselves is to take away a would-be rapist's opportunities. We can only do this if we are ARMED with information on what tricks rapists use and what the countermeasures are.
Let me be clear here, following or not following these countermeasures has absolutely no bearing on who is to blame for a rape. The person commiting the rape is ALWAYS to blame. Women should be able to walk around completely nude, falling down drunk, and fear no physical attack. This is not the society we live in however, so what I am concerned with, is before any rape occurs, what can women do, if anything, to increase their chances of not being raped? In a society where travelers to my city are warned about pickpockets and given advice on how to protect their wallets, I wonder why we are attacking a man for giving women similar advice on how to protect their infinitely more valuable bodies? Because we think that these tips will make people blame women who don't follow them for their rapes? If the victim of a pickpocket is blamed for his wallet being taken because he didn't keep his hand on it in a crowd, do we stop telling people what they need to know about pickpockets?
As a woman who's never been raped and wants to stay that way, I am THANKFUL that someone is trying to warn women about men who put conciousness altering drugs in our drinks so we won't fight when they pull our pants down. I am thankful that when I was younger, my parents impressed upon me to always take a cab home late at night and told me they would ALWAYS pay for it because there are not so nice people out a night who might want to hurt me. I am grateful for any self defense classes offered free to women so we have some chance to resist physically against an attacker. I am grateful for my friends because we watch each others backs when we go out. I am grateful for anything and everything that helps me stay that extra bit safer or more aware of the dangers I face as a woman.
You are not a feminist if by trying to protect women from the blame of being raped, you try to keep them from information that can protect us from being raped in the first place. We are NOT powerless. In some cases we can stop a rape from happening, even if we never know it, by doing something as simple as not drinking something that was out of our sight or having a friend with us at a bar. We might never know it, but taking a cab home, or walking in a group, can keep us from being targeted by a rapist. To do these things however, requires that we know men put date rape drugs in drinks and target women who are alone.